Avoid redundant internal calls to services/users/user

[following5]

All the editing, delting and "capabilites" methods need to verify the user. Currently this needs redundant calls to a services/users method to map between UUID and internal user id.

Evaluate if we can either

• add the internal user ID to the owner / user return value of internally requested caches and logs, or
• add the user UUID to request tokens.

[following5]

Typical example: commit 714f090. Need to pass the $request and UUID and then redundantly fetch the (owner's) user data, to get the internal ID.

I think we should automatically add an internal_id field to the geocaches owner and log entry user fields for all internal method calls.

[following5]

A good solution is to add owner_fields and log_user_fields options to services/caches/geocache(s), and user_fields option to services/logs/entry(s). This allows to query the internal IDs, if needed.