Make dictionary read/write locking consistent in CapabilitiesModule, rename two dictionary fields to standard m_ format
Add "show caps stats by user" and "show caps stats by cap" console commands to print various counts of capability invocation by user and by cap

This currently prints caps requests received and handled, so that overload of received compared to handled or deadlock can be detected.
This involves making BaseStreamHandler and BaseOutputStream record the ints, which means inheritors should subclass ProcessRequest() instead of Handle()
However, existing inheriting classes overriding Handle() will still work, albeit without stats recording.
"show caps" becomes "show caps list" to disambiguate between show caps commands
Merge branch 'master' of ssh://opensimulator.org/var/git/opensim
Merge branch 'master' of ssh://opensimulator.org/var/git/opensim