Merge pull request #1068 in CASA/casa from CAS-12562 to master
* commit 'b2e8598281912a0dd0100d145af89cfc6e921510':
remove debugging output
synchronize final invoations between grpc & gui threads
move casacore back from fork and sync with master
fix remaining pixmap calls from non-gui thread
fix segvs
resolve problems with test_averaging_antenna
update parameters within qtGO evaluation
plotms fixes for linux
add debug func
move to github fork
