Yet another picture viewer.

Installation of AISS is recommended.

Version history:
- 1.4 (3rd January 2013):
 - Fixed iconification in full screen mode
 - Combined separate directory and file loading
 - Files are sorted in alphabetical order when a directory is loaded
 - Fixed file name displaying in the window title bar
 - German language included

- 1.3 (29th December 2012):
 - Removed using spacebar to switch between window and full screen
 - Fixed handling of disabling/enabling buttons
 - Fixed wrong help texts of picture rotation buttons when AISS is used
 - Fixed picture rotation issues
 - Fixed file loading issues
 - Fixed: Now thumbnails display is shown after switching between
   window and full screen if it was in use already
 - Fixed: Renamed the catalogs directory back as Catalogs;
   I made a mistake to rename Catalogs as Language_Catalogs
   to make it more understandable to users but the operating system
   won't find it with such a name. I forgot to change the language installer
   script to handle this name change
 - Fixed directory selection in prefs window
 - Fixed some other issues
 - Updated language catalogs: Finnish, Italian, Greek and English builtin

Todo:
 - Some improvements