Added versioning based on git history instead of svn keywords.

Uniformity is best.

Switch to a better approach to integrating the main loop.
This will support testing for readiness before needlessly running a kernel call.

Beginning support for recursive SDWB.

These will work much nicer in hardware.

... I wish more libraries did this!

Remove 8-bit eb_address_t support.
... The config space is at least 16 bit wide.

I think its safe to assume our command-line tools have such an environment.

This allows us to provide sub-word bus access.