Log Message:
Update to 8.3.0

Changelog:
2019-01-07  Jay Berkenbilt  <ejb@ql.org>

	* 8.3.0: release

	* Add sample completion files in completions. These can be used by
	packagers to install on the system wherever bash and zsh keep
	their vendor-supplied completions.

	* Add configure flag --enable-check-autofiles, which is on by
	default. Packagers whose packaging systems automatically refresh
	autoconf or libtool files should pass --disable-check-autofiles to
	./configure to suppress warnings about automatically generated
	files being outdated.

2019-01-06  Jay Berkenbilt  <ejb@ql.org>

	* Remove the restriction in most cases that the source QPDF used
	in a copyForeignObject call has to stick around until the
	destination QPDF is written. The exceptional case is when the
	source stream gets is data using a
	QPDFObjectHandle::StreamDataProvider. For a more in-depth
	discussion, see comments around copyForeignObject in QPDF.hh.
	Fixes #219.

2019-01-05  Jay Berkenbilt  <ejb@ql.org>

	* When generating appearances, if the font uses one of the
	standard, built-in encodings, restrict the character set to that
	rather than just to ASCII. This will allow most appearances to
	contain characters from the ISO-Latin-1 range plus a few
	additional characters.

	* Add methods QUtil::utf8_to_win_ansi and
	QUtil::utf8_to_mac_roman.

	* Add method QUtil::utf8_to_utf16.

2019-01-04  Jay Berkenbilt  <ejb@ql.org>

	* Add new option --optimize-images, which recompresses every image
	using DCT (JPEG) compression as long as the image is not already
	compressed with lossy compression and recompressing the image
	reduces its size. The additional options --oi-min-width,
	--oi-min-height, and --oi-min-area prevent recompression of images
	whose width, height, or pixel area (width * height) are below a
	specified threshold.

	* Add new option --collate. When specified, the semantics of
	--pages change from concatenation to collation. See the manual for
	a more detailed discussion. Fixes #259.

	* Add new method QPDFWriter::getFinalVersion, which returns the
	PDF version that will ultimately be written to the final file. See
	comments in QPDFWriter.hh for some restrictions on its use. Fixes
	#266.

	* When unexpected errors are found while checking linearization
	data, print an error message instead of calling assert, which
	cause the program to crash. Fixes #209, #231.

	* Detect and recover from dangling references. If a PDF file
	contained an indirect reference to a non-existent object (which is
	valid), when adding a new object to the file, it was possible for
	the new object to take the object ID of the dangling reference,
	thereby causing the dangling reference to point to the new object.
	This case is now prevented. Fixes #240.

2019-01-03  Jay Berkenbilt  <ejb@ql.org>

        * Add --generate-appearances flag to the qpdf command-line tool to
	trigger generation of appearance streams.

	* Fix behavior of form field value setting to handle the following
	cases:
	  - Strings are always written as UTF-16
	  - Check boxes and radio buttons are handled properly with
	    synchronization of values and appearance states

	* Define constants in qpdf/Constants.h for interpretation of
	annotation and form field flags

	* Add QPDFAnnotationObjectHelper::getFlags

	* Add many new methods to QPDFFormFieldObjectHelper for querying
	flags and field types

	* Add new methods for appearance stream generation. See comments
	in QPDFFormFieldObjectHelper.hh for generateAppearance() for a
	description of limitations.
	  - QPDFAcroFormDocumentHelper::generateAppearancesIfNeeded
	  - QPDFFormFieldObjectHelper::generateAppearance

	* Bug fix: when writing form field values, always write string
	values encoded as UTF-16.

	* Add method QUtil::utf8_to_ascii, which returns an ASCII string
	for a UTF-8 string, replacing out-of-range characters with a
	specified substitute.

2019-01-02  Jay Berkenbilt  <ejb@ql.org>

	* Add method QPDFObjectHandle::getResourceNames that returns a set
	of strings representing all second-level keys in a dictionary
	(i.e. all keys of all direct dictionary members).

2018-12-31  Jay Berkenbilt  <ejb@ql.org>

	* Add --flatten-annotations flag to the qpdf command-line tool for
	annotation flattening.

	* Add methods for flattening form fields and annotations:
	  - QPDFPageDocumentHelper::flattenAnnotations - integrate
	    annotation appearance streams into page contents with special
	    handling for form fields: if appearance streams are up to date
	    (/NeedAppearances is false in /AcroForm), the /AcroForm key of
	    the document catalog is removed. Otherwise, a warning is
	    issued, and form fields are ignored. Non-form-field
	    annotations are always flattened if an appearance stream can
	    be found.
	  - QPDFAnnotationObjectHelper::getPageContentForAppearance -
	    generate the content stream fragment to render an appearance
	    stream in a page's content stream as a form xobject. Called by
	    flattenAnnotations.

	* Add method QPDFObjectHandle::mergeResources(), which merges
	resource dictionaries. See detailed description in
	QPDFObjectHandle.hh.

	* Add QPDFObjectHandle::Matrix, similar to
	QPDFObjectHandle::Rectangle, as a convenience class for
	six-element arrays that are used as matrices.

2018-12-23  Jay Berkenbilt  <ejb@ql.org>

	* When specifying @arg on the command line, if the file "arg" does
	not exist, just treat this is a normal argument. This makes it
	easier to deal with files whose names start with the @ character.
	Fixes #265.

	* Tweak completion so it works with zsh as well using
	bashcompinit.

2018-12-22  Jay Berkenbilt  <ejb@ql.org>

	* Add new options --json, --json-key, and --json-object to
	generate a json representation of the PDF file. This is described
	in more depth in the manual. You can also run qpdf --json-help to
	get a description of the json format.

2018-12-21  Jay Berkenbilt  <ejb@ql.org>

	* Allow --show-object=trailer for showing the document trailer.

	* You can now use eval $(qpdf --completion-bash) to enable bash
	completion for qpdf. It's not perfect, but it works pretty well.

2018-12-19  Jay Berkenbilt  <ejb@ql.org>

	* When splitting pages using --split-pages, the outlines
	dictionary and some supporting metadata are copied into the split
	files. The result is that all bookmarks from the original file
	appear, and those that point to pages that are preserved work
	while those that point to pages that are not preserved don't do
	anything. This is an interim step toward proper support for
	bookmark preservation in split files.

	* Add QPDFOutlineDocumentHelper and QPDFOutlineObjectHelper for
	handling outlines (bookmarks) including bidirectionally mapping
	between bookmarks and pages. Initially there is no support for
	modifying the outlines hierarchy.

2018-12-18  Jay Berkenbilt  <ejb@ql.org>

	* New method QPDFObjectHandle::getJSON() returns a JSON object
	with a partial representation of the object. See
	QPDFObjectHandle.hh for a detailed description.

	* Add a simple JSON serializer. This is not a complete or
	general-purpose JSON library. It allows assembly and serialization
	of JSON structures with some restrictions, which are described in
	the header file.

	* Add QPDFNameTreeObjectHelper class. This class provides useful
	methods for dealing with name trees, which are discussed in
	section 7.9.6 of the PDF spec (ISO-32000).

	* Preserve page labels when merging and splitting files. Prior
	versions of qpdf simply preserved the page label information from
	the first file, which usually wouldn't make any sense in the
	merged file. Now any page that had a page number in any original
	file will have the same page number after merging or splitting.

	* Add QPDFPageLabelDocumentHelper class. This is a document helper
	class that provides useful methods for dealing with page labels.
	It abstracts the fact that they are stored as number trees and
	deals with interpolating intermediate values that are not in the
	tree. It also has helper functions used by the qpdf command line
	tool to preserve page labels when merging and splitting files.

	* Add QPDFNumberTreeObjectHelper class. This class provides useful
	methods for dealing with number trees, which are discussed in
	section 7.9.7 of the PDF spec (ISO-32000). Page label dictionaries
	are represented as number trees.

	* New method QPDFObjectHandle::wrapInArray returns the object
	itself if it is an array. Otherwise, it returns an array
	containing the object. This is useful for dealing with PDF data
	that is sometimes expressed as a single element and sometimes
	expressed as an array, which is a somewhat common PDF idiom.

2018-10-11  Jay Berkenbilt  <ejb@ql.org>

	* Files generated by autogen.sh are now committed so that it is
	possible to build on platforms without autoconf directly from a
	clean checkout of the repository. The configure script detects if
	the files are out of date when it also determines that the tools
	are present to regenerate them.

	* Add build in Azure Pipelines, now that it is free for open
	source projects.