Author: Petr Skoda
MDL-31845 add "Local category field" option in database enrol plugin
This patch uses code from the original patch by Michael Aherne, most of the credit goes to him.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=e042c58df16e62fb3c2d215d3d82dbcd9bd0ba17
http://github.com/moodle/moodle/commit/e042c58df16e62fb3c2d215d3d82dbcd9bd0ba17
+ 2.3 en [localcategoryfield,enrol_database]
+ 2.3 en [newcoursecategory,enrol_database]