WipeFreeSpaceGUI2 version 1.2 released!

WipeFreeSpaceGUI2 version 1.2 has just been released.

Added support for the --order option in WipeFreeSpace.
Added unit tests for all the classes (current coverage: 63% with GUI, 31% in headless mode).
Many code improvements, simplifications, fixes and refactorings.
UI improvements and fixes.
Improvements in the build system.
Updates in documentation.