Merge pull request #843 in CASA/casa from feature/CAS-12083 to master
* commit 'f65ccb480217ebca8b09badda965e79763f686de':
remove polaverage from mstransform and add intent and minor updates for sdpolaverage
add a new SD task sdpolaverage
add unit tests for polaverage.
add polaverage to mstransform.
Merge pull request #840 in CASA/casa from bugfix/CAS-12132 to master
* commit '1120d52026d101177ff903579a73c054d72da080':
latest workaround for chanchunk i.e recreating a new vi every chunk
Put in workaround suggested by Enrique
Work around a weird vi2 behavior