VESPERS: Turns out I hadn't implemented connected for the CCD detector class.  This has been remedied and should allow the disk usage information in the VESPERSPilatusCCDDetectorView to display properly.
VESPERS: Added a method that checks for the key mounting points for the VESPERS app to run.  Fixes #442
VESPERS: Switched from using QDir::exists to QFileInfo::exists so that symlinks are valid targets.  Gave proper error codes to the error mons in VESPERSBeamline as well as added the current value of the the control where necessary.  Needs some testing, but this should fix #441.
VESPERS: Changed the df in VESPERSPilatusCCDDetector to not hold up the event loop.  Changed all the scan controllers to change the pilatus file path if a proposal number was given to beginning dialog (implies a user).
Merge branch 'master' into VESPERS_Release