Implemented GetOff feature, proper Offlining

-getOff-setup.py: py2exe now ignores MSVCP90.dll
-MySQLSetup.py: added comments to describe status codes
-RenderNodeMain: moved the childProcess initializer to __init__ method
added comments to summarize certain blocks of code
fixed a bug where the rendernode was reading the status it had recently
set for itself instead of reading it from the database
added a couple of lines to the debug log to show the status of the
rendernode
-offline-setup.py: made an executable version of offline.py. Will
probably not use it after the online/offline/getoff GUI is up and
running