Browse the glossary by more than one alphabet

Browse the glossary by more than one alphabet - See http://moodle.org/mod/forum/discuss.php?d=148751

Patch provided against current 1.9.8 version for 2 files : lib.php and mod_form.php
IMPORTANT : for the patch to work, you must ADD a "specialalphabets" field to your moodle's database glossary table.
For example, for mysql, issue the following sql statement (in phpMyAdmin or other interface):
ALTER TABLE `mdl_glossary` ADD `specialalphabets` VARCHAR( 255 ) NOT NULL

Please test on test site before production site.

To Glossary module maintainer : please study feasibility of making this new feature available to Moodle 2.1 version. Obviously the demand for the feature will be minimal, but it looks like it will be very useful to those (few) people who will need it.

Joseph