Bug 16683: Help links to fields 59X in cataloguing form are broken

Bug 16683: Help links to fields 59X in cataloguing form are broken

This patch adds more specificity to handling of MARC21 documentation
links in the basic MARC editor.

To test, apply the patch and make sure the "advancedMARCeditor" system
preference is set to "Display."

You may need to edit a bibliographic framework so that 09x, 59x, and 69x
tags will display in the editor.

Edit or create a bibliographic record using that framework. Next to each
tag label in the editor should be a "?" link. Clicking this link should
open a new window with the correct Library of Congress documentation
page.

Check the links for 09x, 59x, and 69x tags as well as others to confirm
they open the correct pages.

Signed-off-by: Cori Lynn Arnold <carnold@dgiinc.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>