Set the version to 3.2 in CMakeLists.txt

In preparation for 3.2-rc1

Fix Exec line of desktop files.

They needed %f to indicate how to pass the file we're claiming to handle.

Update CMakeLists.txt

Version 3.0

Improved de_DE

See #890 and its changed menu item

Version 3.0, release candidate 1

Version 2.3

Release 2.3 is a bug-fix release.

Version 2.2

Release 2.2 is a bug-fix release.

Version 2.1

Release 2.1 introduces *nix compatibility, internationalization,
technical drawing mode, rewritten DXF export, DXF import, and many other
minor features and bug fixes.

Version 2.1, release candidate 1

Release 2.1 introduces *nix compatibility, internationalization,
technical drawing mode, rewritten DXF export, and many other minor
features and bug fixes.