Bug 6982 - Don't show MARC tag documentation links for NORMARC

Bug 6982 - Don't show MARC tag documentation links for NORMARC

Links to UNIMARC documentation were being shown when marcflavour =
NORMARC. This patch hides the doc link functionality for NORMARC
by hiding:
1. The checkbox for turning doc links on/off
2. The hyperlinked questionmarks

This patch does not hide e.g. the JavaScript functions related to
the doc link functionality, in order to make it easy to add
doc links for NORMARC in the future (hopefully).

The doc link functionality was passing a variable called MARC21
(based on the contents of the marcflavour syspref) to the
template and testing the value of this to decide if MARC21 or
UNIMARC doc links were to be shown. I have replaced this variable
with he standard/full marcflavour syspref, in order to make it
possible to test for more then two MARC dialects.

To test:
- Set the marcflavour syspref to MARC21, NORMARC and UNIMARC, one
  after the other.
- Check that correct doc links are shown for MARC21 and UNIMARC
  on the cataloguing screen, and that no checkbox and no doc links
  are displayed for NORMARC.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Works as described - thx for the great test plan!

Signed-off-by: Ian Walls <ian.walls@bywatersolutions.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>