Create gui-window xml-file
Name create_contract_window properly im XML
Show create_contract_window on startup, do not hook anything up yet
Start defining complete GUI in one xml file
Extend GUI and hook up first handlers
Define interface for windows, cleanup GUI-code
Merge branch 'master' into gui
Actually _do_ split up interface in multiple glade files, to easier keep
track of adjustments and other top-level-widgets
Fix contract-gui such that it can actually take input
Add calendars for date entry in contract-gui
Initialize contract-calendars on startup
Implement project-creation window
Add category- and project-gui

Add category.glade, project.glade
Remove gui.xml
Implement ObjectChooserButton
Remove superflouous contractmodel from project-gui-xml
Add notebook-based gui-xml
Start moving gui to notebook-based design
Fix contract-spinbutton in notebook.glade
Remove leftover gui-files from previous attempts