Pull request #929: CAS-14502
Merge in CASA/casa6 from CAS-14502 to master
* commit '63cbe9835f1b924a1c54e7713c75af5e7004ab96':
Update build.conf to master versions CAS-14502
Update build.conf for CAS-14502
Set -std=c++17 explicitly
potential fix for "TypeError: in method 'quanta_quantity', argument 2 of type 'casac::variant const &'"
Update casaconfig to version 1.0.3
add casac:: namespace qualification to variant use to avoid conflict with C++17 variant
Change bind2d to std::bind in PVGenerator.cc
Change bind2d to std::bind in ImageProfileFitter.cc
Replace mem_fun in VisibilityProcessing.cc
Replace mem_fun_ref with mem_fn in VisibilityProcessing.cc
Update casaconfig for CAS-14502
Update casacore reference to cc6d8b5a43b47ced4ef97c4628346384592b9cbd
Update CMAKE_CXX_STANDARD to 17
