Pull request #630: CAS-12555: Flagdata in mode shadow seems to leave a little shadowed data unflagged
Merge in CASA/casa6 from CAS-12555 to master
* commit '84edf095b6dceb541d3057f09001ee21ed788443':
update test data dir/link, CAS-12555
add test_shadow_alma_small, compare with expectations using _check_uvw_match_shadow, CAS-12555
test_shadow_APP_with_sel with mix of (1) and (2) calculations, CAS-12555
update test expects, CAS-12555
comments for blocks 1 & 2 in calculate func, CAS-12555
Reuse uvw coords from ms for shadow flagging.