Merge pull request #246 in CASA/casa from hotfix/fix-testrefimager-in-5.1.0 to release/5.1.0
* commit 'ae26418dfacd4e20a076971f9bca41b128dcd822':
Set conjbeams=true in test_widefield_mosaicft_mtmfs
Merge pull request #244 in CASA/casa from bugfix/CAS-10543 to release/5.1.0
* commit '0dfe3b150dbde7faf3fdaf5684bb5c21bde6bce9':
Update casacore reference to b71cbe7bb1a1910168a1afb950402d26b1b45ece