Merge pull request #406 in CASA/casa6 from CAS-13437 to master
* commit 'd994a71e1bef4ef2327868dc2e84fa8a634529ff':
Point casacore to the latest commit in master Fixes partially CAS-13437
Initialize properly scanSeen variable
Use a branch in personal casacore that mimics how casacore will look like after merged PRs
Use the same initialization of the variables that control the metadata scope as the parent class MSIter.
Rebase casacore changes for CAS-13437 on top of more recent changes related to MSMetaData CAS-13437: Point to different commit in casacore
VisibililtyIterator: Leave the columns referencing a valid table.
Ensure that the underlying TVI uses is reset to originChunks before accessing any metadata
Rebase casacore changes on top of master as of Nov 2020
Points to private casacore repository
Use same setState() method as in casacore MSIter
