MDL-47466 calendar: use get_in_or_equal() in function calendar_get_events to fix problem with ORA-01795
MDL-47466 calendar: fixed error ORA-01795 in calendar_get_events
MDL-47930 mod_forum: Display all forum statuses correctly

It is possible for users with the mod/forum:managesubscriptions to
subscribe to forums with subscription disabled. This is handled by
forum_get_subscribe_link() already and should have been handled here all
along.
MDL-47793 assign: Reset reveal identities
MDL-46500 filepicker: prevent error when element does not exist
MDL-46500 mod_data: Removing duplicate filemanager initialisations
MDL-43430 enrol_ldap: Enrolment lost if member of group with parenthesis

As part of fixing MDL-43430, a typo has been detected in the
quoted alphanumeric characters (the '=' and '>' were transposed).
MDL-43430 enrol_ldap: Enrolment lost if member of group with parenthesis

The group names we get from ldap_find_user_groups() can contain invalid LDAP
filter characters. So we need to escape them for LDAP filter usage.
MDL-27930 Lesson: the count-down timer does not work
MDL-48035 Merge English strings from the en_fix language pack
Merge branch 'MDL-48035-26-enfix' of git://github.com/mudrd8mz/moodle into MOODLE_26_STABLE
MDL-45416 enrol_ldap: Use null_progress_trace while running phpunit
Merge branch 'MDL-27930_26' of git://github.com/jmvedrine/moodle into MOODLE_26_STABLE
MDL-27930 lesson: Remove custom styling from timer
Merge branch 'MDL-47930-26' of git://github.com/andrewnicols/moodle into MOODLE_26_STABLE
Merge branch 'MDL-47793-m26' of https://github.com/micaherne/moodle into MOODLE_26_STABLE
MDL-47793 assign: trivial fix for inconsistent use of get_instance()
MDL-43430 enrol_ldap: Enrolment lost if member of group with parenthesis

While testing the fix, it was found that ldap_stripslashes() was broken and
using a deprecated PCRE patter modifier, so it's also been fixed.

Thanks to Damyon Wiese, some units tests have been added to cover
ldap_addslashes() and ldap_stripslashes().
Merge branch 'MDL-46500_26' of https://github.com/dmonllao/moodle into MOODLE_26_STABLE
MDL-48019 mod_forum: Add sesskey checks when setting tracking prefs

This also removes set_url() and changes require_course_login to
require_login as guests cannot set tracking.