MDL-36741 mod_forum: fixed SQL that was generated when either timed posts or groups were enabled
MDL-36680 core_grade: fixed grade_report::blank_hidden_total()
MDL-35653 - mod/wiki: Force format now lets users edit wiki pages.

Thanks to Tõnis Tartes for part of this solution.

When force format was selected in the options, trying to view the
wiki would redirect to the front page with a message saying that
you do not have permission to edit this page. Students had no way
of viewing any entries or creating the first page.

When in force format it skips a page , which would be considered
uncessary for students, but this means that the group id is not set
and this is what is causing most of the problems.

I also have included a check to see if the title is default and whether
the user has permission to view all groups. In these situations the
intermediate page is displayed.
MDL-35833 - Blocks - Adding alt and title attributes to the docked-block panel close button
MDL-37280 remove bogus lang_string causing fatal error

Credit goes to Lorenzo Nicora, thanks.
MDL-37068 qformat_learnwise: fix UTF8 and other issues.
MDL-37283 import tinymce spellchecker 2.0.6.1
Merge branch 'wip-MDL-35653-MOODLE_22_STABLE' of git://github.com/abgreeve/moodle into MOODLE_22_STABLE
MDL-25928 course: fixed use of lang_string
Merge branch 'wip-MDL-35833-stable22' of git://github.com/phalacee/moodle into MOODLE_22_STABLE
MDL-37290 course: fixed up navbar when editing categories
Merge branch 'w51_MDL-37283_m22_spell' of git://github.com/skodak/moodle into MOODLE_22_STABLE
Merge branch 'wip-MDL-37290-m22' of git://github.com/samhemelryk/moodle into MOODLE_22_STABLE
Merge branch 'MDL-37146_22' of git://github.com/andyjdavis/moodle into MOODLE_22_STABLE
MDL-36680 - fix bad whitespace
weekly release 2.2.6+
Automatically generated installer lang files
MDL-27884 Implement proper username validation during csv import
MDL-37161 Backup: Database error caused by grade book settings when importing or restoring a course
Merge branch 'MDL-36741_m22' of git://github.com/markn86/moodle into MOODLE_22_STABLE