MDL-33486 wiki: allow searching individual wikis
MDL-43021 course: corrections to the shortname and idnumber uniqueness validation
Merge branch 'wip-MDL-33486-m25' of git://github.com/marinaglancy/moodle into MOODLE_25_STABLE
Merge branch 'wip-MDL-43021-m25' of git://github.com/marinaglancy/moodle into MOODLE_25_STABLE