In this patch, we introduce, majorly:
	* LibZUDI and udi_mei_call().
	* FloodplainnStream::connect() (!!!).
	* FloodplainnStream::createChannel().

Essentially we can now connect to drivers (technically, though not practically)
from non-driver processes.

* Wrote a bunch of accessor functions of various kinds.
* Deleted the previous incarnation of udi_usage_res().

* UDI:
  * Now pretty much completed anchoring, and cross-channel sending of
    channel messages (fplainn::sChannelMsg).
  * Implemented FloodplainnStream::createChannel().
  * Added udi_mei_call() to libzudi.
  * Re-namespaced all the udi_mgmt calls that were in fplainn::Zudi.