hdf5doc

Merge pull request #16 in HDFFV/hdf5doc from vol_docs to master

* commit '009dfbff6fdd6976182c1f57ebadfbbe7c7e57e6': (21 commits)
  Updaed the VOL docs to reflect pending H5Dget_offset() changes.
  Updated VOL user guide and connector author guide to be in agreement with final 1.12.0 changes.
  The VOL connector author guide should be largely done for the time being.
  Extra pass over GET/SPECIFIC callback variable args.
  Added "HDF5 1.12.0" as a subtitle to the VOL UG.
  Updated the VOL UG based on feedback.
  Most API changes in. Still need to move "helper" text over.
  Renamed things
  Fixed a few missing things. Did some renaming.
  Almost done with the VOL UG.
  Updates to quickstart
  Corrections to some API calls in the big HDF5 API call to VOL callback table. Marked functions as deprected in all tables.
  Added preliminary breakdown of HDF5 API calls by VOL callback to the user guide. This will probably get moved to the connector author guide but it can live here for now.
  Added a "preliminary" text box for use throughout the documentation.
  Added tables for native-only and VOL-independent API calls.
  * Switched titles in the guides * Plugin --> connector rename in the internals guide
  Added sections to the user guide.
  Unified title pages across documents.
  Added empty container for user guide.
  Moved existing documentation to new locations.
  ...