Flagmanager

Help on flagmanager task:

Enable list, save, restore, delete and rename flag version files.


        These flag version files are copies of the flag column for a
        measurement set.  They can be restored to the data set to obtain
        a previous flag version.  On running importvla, a flag
        version call 'Original' is automatically produced.  It is wise to
        save a flagversion at the beginning or after serious editing.

        Keyword arguments:
        vis -- Name of input visibility file
                default: none. example: vis='ngc5921.ms'
        mode -- Flag version operation
                default: 'list'; to list existing flagtables
                'save' will save flag column from vis to a specified flag file
                'restore' will place the specified flag file into vis
                'delete' will delete specified flag file
                'rename' will rename a specified flag file
        versionname -- Flag version name
                default: none; example: versionname='original_data'
                No imbedded blanks in the versionname
        comment -- Short description of a versionname, when mode is 'save' or 'rename'
                default: ''; example: comment='Clip above 1.85'
                comment = versionname
        oldname -- When mode='rename', the flag file to rename
        merge -- Merge operation
                Options: 'or','and', but not recommended for now.