Merge pull request #162 in CASA/casa6 from CAS-10893 to master
* commit '0f44433d1203d2ed5a9bb03c1fca3e4358293741':
add 'final' to SDGrid.
remove FTMachine::isSD_p and add FTMachine::isSD() and SDGrid::isSD().
updates based on comments from Takeshi.
fixed unit test for CASA5
removed changes for CAS-10891, and also made minor clean-ups
modification for CAS-10893/CAS-10891