add validation block to copy functions (#4596)
don't write GRATICULE connectiontype (#4165)

The graticule connectiontype is only used internally, and should
not be exposed in a mapfile as it is rejected by the parser.
Mark disabled layers as processed to prevent from being displayed in nested groups (#4533)
Merge branch 'branch-6-2' of https://github.com/mapserver/mapserver into branch-6-2
Merge branch 'branch-6-2'