Bug 12823: Add some hints for Host and Database

Bug 12823: Add some hints for Host and Database

When adding or editing a SRU server, this patch adds a hint, positioned
under the Hostname field.
It also moves similar information for SRU options and XSLT into hints.

Test plan:
Add/Edit SRU server. Look at Hostname, SRU options and XSLT.
Add/Edit Z39.50 server. No hints for Hostname and SRU options.

Signed-off-by: Nick Clemens <nick@quecheelibrary.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>