Switch to --all instead of an incomprehensible 0
Only ever dump UserDefined groups, even with --all
fixup! Switch to --all instead of an incomprehensible 0
Add a --limit-to-privileged option
Add a --skip-disabled option
Add Applies-To information about CF's

This still leaves in a small bug: Unused CF's on the sending side turn
into globally applied CF's when importing this metadata.  Not a huge
deal IMO.

Note that in 4.2 this structure is renamed to ApplyTo together with a
field named LookupType.
Make dumped ACLs not include references to principal ids
Add a pointer to the initialdata docs
Do not dump references to tickets

Bookmarks shouldn't be dumped.
Merge branch '4.0/dump-metadata-cleanups' into 4.0-trunk