created gui_tray using pyqt
*prepared everything for the HANA DB plugin - works for maintainer
*SQLite plugin introduced (functionality has to be transferred from old
code)
Completely replaced gtk by PyQt4
removed stupid auto-generated import
Fixed tray icon image path
fixed webcam plugin, removed gobject timers
added convenience methods for git commands, using settings for default directory accesses, removed legacy indicator applet
Settings dialog is organized in a combo box, not tabs (this is really necessary on a Mac)
improved settings dialog layout
*concept for plugins a bit clearer - options rewrite necessary
Completely refactored table models

- lunch_server.members is not a list of IP adresses, names are stored only in members_info
- changes to members or messages data are directly propagated to the tables
Improved table layout
fixed updating plugin repository
removed stupid auto-generated import
using /usr/bin/python if /opt/local/bin/python does not exist
fixed logging error
fixed maintainer plugin
removed unnecessary print statement
replaced threading.Thread through QThread