feat: distinguish writeable and read-only SEs in DIRAC topology
BEGINRELEASENOTES
*ResourceStatus NEW: add a new "read_only" field to topology file, indicating whether the SE is writable or not
ENDRELEASENOTES
BEGINRELEASENOTES
*ResourceStatus NEW: add a new "read_only" field to topology file, indicating whether the SE is writable or not
ENDRELEASENOTES