Bugfixes:
* Add -d debug_level to UG.
* In the future, switch to json_object_object_get_ex() (since
json_object_object_get() is depricated in the latest libjson).
* Add the option to MS's register API and MSVolumeRequestHandler to
allow anonymous gateways to request Volume information.
* Expand semantics of the debug level in libsyndicate to cover both
normal (i.e. dbprintf()) debugging, as well as lock debugging (used by
the UG).
* WIP: OpenCloud deleters (but wait for Sapan to get the new deleter
code out).
* Remove old config options from libsyndicate.
* Rename existing config options that have changed meaning.
* Allow the UG driver loader to ignore the lack of driver code if the
gateway is running anonymously (in which case, the Volume owner will
need to upload a driver for gateway ID "GATEWAY_ID_ANON" if he/she wants
anonymous gateways to have a particular driver).  TODO: add an
easy-to-use option for doing this to syntool.
* Rename a couple methods in ms-client.cpp for public-key registration
to make their purpose clearer.