refs #8026 Unit test illustrating the problem

and some spelling errors.
refs #8026 Partial fix which breaks number of tests

and some spelling errors.
refs #8026 Redefined isPowder function to check transformation mode

and more spelling errors.
refs #8026 minor comments
Merge branch 'master' into bugfix/8026_ConvertToMDFails
Merge branch 'master' into bugfix/8026_ConvertToMDFails
Merge remote-tracking branch 'origin/bugfix/8026_ConvertToMDFails'

Conflicts:
	Code/Mantid/Framework/MDAlgorithms/src/ConvertToMD.cpp