Log Message:
Updated to 0.50.

Changelog:
=== 0.50 - Mon 14 Feb 2011 ===
Maintenance release with many bug fixes. Biggest change is the refactoring
of input forms and dialogs, but this is not very visible to the user.

* Added custom tool option to get wiki formatted text
* Added option to Task List plugin to mix page name elements with tags
* Added style config for linespacing
* Cursor is now only set from history when page is accessed through history
* Updated latex export for verbatim blocks and underline format
* Added basic framework for plugins to add widgets to the main window
* Notebook list now shows folder path and icon - Stefan Muthers
* Folder last inserted image is now remembered - Stefan Muthers
* Preview is now shown when selecting icons files - Stefan Muthers
* Image paths are now made relative when pasting image an file - Ji Janoue
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* Image data is now accepted on the clipboard directly - Stefan Muthers
* Added overview of files to be deleted to Delete Page dialog to avoid 
  acidental deletes
* Added traceback log to "You found a bug" error dialog
* Fixed critical bug for windows where zim tries to write log file 
  to a non-existing folder
* Fixed critical bug where text below the page title goes missing on rename
* Fixed behavior when attaching files, will no longer automatically overwrite
  existing file, prompt user instead - Stefan Muthers
* Fixed bug when opening notebooks through an inter-wiki link
* Fixed support for month and year pages in Calendar namespace
* Fixed support for wiki syntax in Quick Note dialog when inserting in page
* Fixed bug in Task List plugin where it did not parse checkbox lists with a 
  label above it as documented in the manual
* Fixed bug with custom template in export dialog - Ji Janouek
* Fixed bug with style config for tab size
* Fixed many more smaller bugs
* Rewrote logic for indented text and bullet lists, fixes remaining
  glitches in indent rendering and now allow formatting per bullet type
* Refactored part of the Attachment Browser plugin, no longer depends 
  on Image Magick for thumbnailing and added action buttons
* Refactored code for input forms and decoupled from Dialog class
* Refactore History class to use proper Path objects
* Added significants amount of test coverage for dialog and other interface
  elements
* Package description of zim was rewritten to be more readable
* Added translation for Danish