Mostly work on refining the VFS base classes. They are highly templated, which
is something I'm not very happy about, but the type safety is really priceless.

* Moved the Distributary VFS classes out of distributaryTribC, and into a
  separate header.
* Defined most of the base class operations for the inode types in namespace
  vfs.
* Migrated the Hierarchical Storage currentt into its own namespace.