[WMS/WFS] HOWTO updates about "ows_*" metadata now support

[dmorissette]

The WMS/WFS client and server howto need to be updated to reflect the changes
made in bug 568 to support "ows_*" metadata names in addition to the default
"wms_*" or "wfs_*" names.

I think it would be enough to have a paragraph in each document explaining that
(in the case of WMS for instance) MapServer tries the "wms_*" metadata first,
and if not found it tries the corresponding "ows_*" name.  Using this reduces
the amount of duplication in mapfiles that support multiple OGC interfaces since
"ows_*" metadata can be used almost everywhere for common metadata items shared
by multiple OGC interfaces.

This is true for the WCS as well, but does not apply to WMS context documents at
the moment.

[dmorissette]

Need this for 4.4

[jmckenna@…]

updated wfs & wms client docs to mention the use of ows_* metadata.

[jmckenna@…]

also updated the server docs