docs/vfs_catia: rework man page

docs/vfs_catia: rework man page

The vfs_catia man page refers to two configuration variants, one
applying to Samba <= 3.4.x and one referring to Samba >= 3.5.x.
This change removes all information specific to Samba <= 3.4.x, as such
versions have been discontinued.

This change also improves formatting and nomenclature: configuration
parameters, examples and caveats are split into separate sections, and
server-side/client-side terms replace the ambiguous use of Unix and
Windows.

Signed-off-by: David Disseldorp <ddiss@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
Autobuild-User(master): Jeremy Allison <jra@samba.org>
Autobuild-Date(master): Mon Jun 17 23:23:57 CEST 2013 on sn-devel-104