Algorithm to create dummy powder calibration files

[peterfpeterson]

AlignDetectors and DiffractionFocusing require a calibration file which can be difficult to create unless special care is taken to measure appropriate data. Create a new algorithm that takes a workspace and harvests the detector ids from the instrument. All of the offsets will be zero, and the pixels will be all grouped into group one and the final column should be one (use). This will allow generating powder patterns from instruments that have not done a proper calibration.

[peterfpeterson]

This issue was originally trac ticket 2009