Bug 8793 - Fix materialTypeCode/typeOf008 icons for NORMARC XSLT

Bug 8793 - Fix materialTypeCode/typeOf008 icons for NORMARC XSLT

This patch fixes some issues with icons related to materialtypes in NORMARC:

Remove references to opac-tmpl in the *intranet* NORMARC XSLT files.

Add two new icons to koha-tmpl/intranet-tmpl/prog/img/famfamfam/ and
koha-tmpl/opac-tmpl/lib/famfamfam/
GR.png - Graphical materials
TD.png - Three dimentional objects

Copy PR.png from koha-tmpl/intranet-tmpl/prog/img/famfamfam/ to
koha-tmpl/opac-tmpl/lib/famfamfam/

Rename the XSLT variable materialTypeCode to typeOf008 for increased consistency
between stylesheets.

Make sure the XSLT uses icons that are actually available.

To test:
- No use testing all the different permutations of leader pos. 06 and 019b, I think.
- Set marcflavour = NORMARC and turn on default XSLT for OPAC and Intranet, details
  and results.
- Make sure you have a record with something relevant in leader position 6, like
  g for movies or c for music
- Check that the icon turns up in results and details, in the OPAC and Intranet
- Toggle DisplayOPACiconsXSLT and check that the results in the OPAC are as expected

Signed-off-by: Mirko Tietgen <mirko@abunchofthings.net>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>