Pull request #972: CAS-14540
Merge in CASA/casa6 from CAS-14540 to master
* commit 'c8485cbb46080634649156a9f91a20d74831e904': CAS-14540: Add tests for importfitsidi coordframe parameter CAS-14540: Use ICRS as default reference frame in importfitsidi
CAS-14540: Use ICRS as default reference frame in importfitsidi
Use ICRS as the default reference frame and interpret FITS-IDI
data that has the epoch/equinox set to J2000 as using ICRS as well.
Add a new coordframe option to the task to allow the user to
override the default.