MDL-46080 assign: fix offline grading worksheet marker column
MDL-42752 File-picker: Fix tabbing to disabled icons
MDL-46073 badges: Make sure html tags are not used in badge description

Signed-off-by: Yuliya Bozhko <yuliya.bozhko@totaralms.com>
MDL-46280 filter_activitynames: sort activities by length in reverse order
MDL-46218 reshuffled access checks in blog and notes
MDL-45765 Calendar import: Fix undefined variable in cron when updating calendar subscriptions
MDL-46226 core: pix_icon no longer sets title to the alt text
MDL-46197 core_calendar: Added label text to duration in minutes field
MDL-31366 Feedback: decode htmlchars on output to excel
MDL-45562 blog: fixed issues when creating/editing an external blog.
MDL-31089 mod_forum: Filtering non-visible groups
Moodle release 2.6.4
Merge branch 'MDL-45562-26' of git://github.com/lameze/moodle into MOODLE_26_STABLE
Merge branch 'MDL-31089_26' of git://github.com/dmonllao/moodle into MOODLE_26_STABLE
MDL-22469 auth_cas: CAS module : parameter authCAS=NOCAS not properly handled
Merge branch 'wip-MDL-46280-m26' of git://github.com/marinaglancy/moodle into MOODLE_26_STABLE
Merge branch 'MDL-45765-moodle26' of https://github.com/StudiUM/moodle into MOODLE_26_STABLE
MDL-30431 mod_wiki: clarified the logic around editing and deleting wiki comments and added behat tests
MDL-42214 core_message:prevented popup notifications of messages from blocked users
Merge branch 'MDL-46073_26' of https://github.com/totara/openbadges into MOODLE_26_STABLE