Log Message:
Update to 1.20. Add some dependencies so that gtk-depscan runs.
Mark as not ready for python-3.x.

GTK-Doc 1.20    (Feb 16 2014)
============

 Important notice - starting with the next release these long deprecated
 features will be removed, please write to gtk-doc-list@gnome.org and tell us
 your concerns:
 o gtkdoc-scanobj (only used for gtkobject)
 o return values need to be documented using "Returns:". We will remove the
   heuristic that turns a paragraph starting with "Returns " into \ 
return docs.
 o gtkdoc-mktmpl - please move all the comments into the sources.
 o generating html via sgml tools (jade/openjade), using xsltproc and
   docbook-xslt is pretty common and preferred since version 1.6

 Changes

 o 605537 : Returns: listed among parameters
 o 624001 : Support attribute-based method to deprecate symbols
 o 662424 : Class hierarchy about interfaces not generated by default
 o 665926 : should not have to document object structures
 o 666509 : Specifying --enable-gtk-doc should not be required to build source \ 
packages
 o 669417 : Duplicate IDs generated for unions registered as boxed types
 o 671519 : Self-test relies on nonportable (GNU enhanced) 'date' command
 o 692367 : gtkdocize should take a srcdir argument
 o 696570 : style updates
 o 697940 : Race condition between setup-build.stamp and scan-build.stamp
 o 701259 : /bin/bash: -chmod: command not found
 o 701638 : Support automake parallel test harness (fix error with GTKDOC_CHECK)
 o 706404 : Minor bug in gtkdoc-mkdb
 o 706438 : Empty lines added at the beginning and at the end of a programlisting
 o 707426 : master is broken in picking up flavour from configure.ac
 o 707717 : Support " Deprecated: X.Y "
 o 708268 : New *-insensitive.png files are not distributes
 o 710478 : gtkdoc-mkdb: Don't complain about annotations with hyphen
 o 711111 : gtkdoc-mkdb: sort entries in the glossary
 o 711598 : gtkdoc-scan doesn't ignore decorators containing parentheses
 o 719644 : docs: make yelp usage conditional in manual
 o 719645 : configure: emit message when looking for yelp
 o 720061 : make: create subdirectories of the content_files to the  builddir
 o 721228 : configure: search for xml catalog in XDG_DATA_DIRS
 o 722479 : cp -u is not portable
 o 723118 : Mark |[ blocks as CDATA
 o 723288 : Fix MarkDown support
 o 723417 : New MarkDown parser
 o 723696 : Add support for blockquote
 o 723812 : Add support for reference links
 o 723913 : List in markdown: < p > inside the last element of a \ 
< ul > list
 o 723991 : Improve the display of the synopsis
 o 724002 : gtkdoc-scan: Fix use of uninitialised value in trace logging

 Contributors

 Alban Browaeys
 Alexander Kanavin
 Carlos Garcia Campos
 Christian Kirbach
 Daniel Mustieles
 David King
 David Nečas
 Dieter Verfaillie
 Dimitris Spingos
 Hib Eris
 Matthias Clasen
 Philip Chimento
 Philip Withnall
 Rafael Ferreira
 Rico Tzschichholz
 Ryan Lortie
 Sebastian Rasmussen
 Sébastien Wilmet
 Stefan Sauer
 Stef Walter
 William Jon McCann
 Zbigniew Jędrzejewski-Szmek