MDL-43789: coursename disallows spaces in user bulk actions filter

coursename filter for user bulk actions.This prevents filtering
based upon courserole if the coursename contains spaces or other non
alphanumeric characters.
MDL-45010 mod_chat: Use H3 instead of H2 in recent activity info
MDL-45046 output: reviewed standard/base layouts and converted where a better option was available
MDL-43673 wiki: verify page tags work as expected

This covers MDL-43109, verifying that saved tags
are available on re-edition of a page, without any warning/error.

Also official tags are verified to be working ok. With support
for multiple options added by MDL-43713 and MDL-43738.
MDL-44991 Behat: step to check if attribute does not contain text

The step checks that an attribute exists, but doesn't contain the
specified text.

Example:
Then the "class" attribute of "#mydiv" "css_element" should
not contain "accesshide"
MDL-45045 block theme: Fake blocks show empty region when editing and clicked.
MDL-45012: Enable support for wma files within tinymce Moodle Media plugin
MDL-43145 dock: fixed up region_completely_docked code to ignore empty regions
MDL-43145 dock: Enable regions before the drag operation starts
MDL-45037 gradebook: Allow dashes in xml grade values to be ignored.

This was delivering an error message when trying to import an exported
xml file (from Moodle).
MDL-45049 improve debugging output in error log for NO_DEBUG_DISPLAY scripts
MDL-44270 files: handle drag-drop js error when event has null types

This can happen when the 'dragover' event fires as has been observed
in Safari. When the dataTransfer.types property of the event is null,
accessing types.length throws a JavaScript error.
MDL-41975 repository_alfresco: Ensure Moodle sends GMT time to Alfresco
MDL-41975 repository_alfresco: Updating details about Alfresco URL and timestamps
MDL-45119 ajax: AJAX exceptions need a String in the Link
MDL-42761 badges: Remove H2s from help popup
MDL-45154 user profiles: avoid redirection warnings
MDL-45148 unit testing: pass role id instead of user id
weekly release 2.5.5+
Merge branch 'wip-MDL-45154-m25' of git://github.com/marinaglancy/moodle into MOODLE_25_STABLE