Merge pull request #553 in CASA/casa6 from CAS-13749 to master
* commit '240c9864011cff28c8a07cd64e6936342b076742':
updates necessary because of changes to measures typing API
fix breakage caused by non-CASA casacore changes
revert gitmodules, modify error message as requested by stake holder
added comments, no change in behavior
fixed type spotted by Tak
Update for correctly specifying default value
updated to allow spw to be specified as list of ints
update interface
slight irrevlevant change so builds get run again
fix quote issue
temp update modules to point to my casacore CAS-13749 add msmd.corrbit()
