vchoi_fork

Added .pdf and .docx versions of the most recent version of the
VFD SWMR RFC.  Updates on the RFC are cursory, and mostly in the
introduction.  The design section is dated -- added a warning to
this effect.

Reviewed and editied the users guide -- specifically:

   Verified instructions for build and test, and also for demos.
   Removed mention of call to autogen.sh, as that will already be
   run on the friendly user release version.

   Re-worked the introduction to better discribe VFD SWMR, and
   to outline current limitations.

   Changed references to "shadow file" to "metadata file" to match
   field names.

Still need to update pointer to the bit-bucket repository for the
friendly user release.

Also, must verify that the demo code mentioned in the user guide
is publicly available.