Major tidy up.  Add explicit header files, thus enabling the .c files to avoid including the kernel headers.
Major tidy up.  Add explicit header files, thus enabling the .c files
to avoid including the kernel headers.

Move a number of definitions of userland functions from
dev/vinum/vinumext.h.

Desired by:	   bde

This commit is the first of a general cleanup of the header files..
It won't be enough to make bde happy.

Remove vinum_perror and associated DEVBUG definition.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase