Merge in CASA/casa6 from CAS-14458 to release/6.6.6
* commit '508d4cb71db113b424bdbb3f04a86187b2605e87':
Add test cases for expected failures in gencal
Add test with the new functionality to create a caltable from ALMA antenna positions JSON file
CAS-14253: Use input JSON file to compute the ALMA antenna position corrections
CAS-14253: Describe the infile parameter for the JSON ALMA antenna positions case