working up toward getting main FBF class replaced
more testing, still working on re-implementing FBF object
work in progress on FBF
much cleaner and simpler, still working on it
still debugging write test pattern
now debugging memmap expansion case
cleanups of _expose_idx, next we need memmap.resize to work
naive solution to expanding memory map
moved doctest patterns into unittests
cleanups and a few small bugfixes
fixes and basic Workspace self-test now passing
docs and more testing