refs #7529 Started new ConvertToMDHelper

which would use ConvertToMD core as the main part of the algorithm
refs #7529 Small further changes

(not in any way completed)
refs #7529 General framework for ConvertToMDHelper2.cpp

probably not yet working correctly
refs #7529 Get rid of test for ConvertToMDHelperParam

as the function has gone
refs #7529 Enabled "distribution" mode conversion for matrix workspace
refs #7529 Something working

but may be incorrect and properties are not copied correctly