Merge pull request #169 from Wetmelon/master

Change to handleCommands
Simple error-handling in KMPCommon compression methods,
need to update callers to check for non-null data being returned as null which indicates an error
Merge branch 'master' of https://github.com/TehGimp/KerbalMultiPlayer
remove unused exception objects
VACUUM database at startup and during backup to disk
Make mouse0 binding to GUI toggle impossible

Having Mouse0 bound to toggle the menu left the UI in an unusable state, requiring settings to be deleted.  This change should abort the rebinding process if Mouse0 is pressed rather than binding it.
Merge pull request #195 from Xjph/patch-1

Make mouse0 binding to GUI toggle impossible
Merge branch 'master' of https://github.com/TehGimp/KerbalMultiPlayer