Dia full changelog

A bugfix and maintenance release.
A lot of translation updates.
28 bugs fixed.
More colors for SADT.
The installer is digitally signed now.

Bugs fixed:
· Crash with help menu entries
· Cannot open or save files or paths with localized characters
· Broken documentation XML file -> building Ubuntu package fails
· Consumes more and more memory over time
· Tools short cuts (e.g. F2, M) don't work after exiting text edit mode by pressing Esc
· Use xdg-open instead of gnome-open
· Use diagtkrc from the config dir instead of current dir
· Fix build warnings
· Building of cairo plug-in fails with DEBUG_CAIRO defined in diacairo.h
· Cairo PNG export doesn't paint the background correctly
· Wrongly translated string exit dialog
· Selection Inverse, Remove, Union... (all broken)
· Integrated UI Crash - with zero zoom
· Shape export crashes with missing symbol gtk_signal_disconnect_by_data
· Crash when closing database table object after adding an attribute (win32)
· Dia entering an endless loop with cairo print/display rendering/png export
· Make libemf support properly optional
· Bashisms in configure