Merge pull request #1077 in CASA/casa from CAS-12600 to master
* commit '831f05a3be29553807fae2de5020defb13368f08':
make parallel cube tclean to use ia.imageconcat instead of stand alone imageconcat
update docs, fix warning CAS-12600 add mode feature to allow user to specify the output format
Just committing brokeness for now so I don't lose it while I go CAS-12600 ImageFactory::fromFile() specializations
Merge pull request #1078 in CASA/casa from bugfix/CAS-12604 to master
* commit '39a1106d72581b1c6dcc4804e7dcf026320c79dd':
resetting the FFT2D object in HetArrayconvfunc and SimplePBConvFunc for chan chunk
Reset the FFT2D object for every chunk