Update to 2.5.5
Approved by: wiz@

Upstream changes:
2.5.5
Highlights
MDL-43733 - Auto-saved responses are used when a quiz attempt is submitted automatically
MDL-27414 - Random short answer matching question type now works again (with thanks to Jean-Michel V辿drine)
Functional changes
MDL-40821 - Language menu in Clean shows language used
API changes
MDL-43882 - "Time spent waiting for the database" value added to performance info
UI changes
MDL-44425 - Skydrive, Box.net and Google Docs are renamed OneDrive, Box and Google Drive respectively to reflect these remote service name changes.
Security issues
MSA-14-0004 Incorrect filtering in Quiz
MSA-14-0005 Access issue in Feedback activity
MSA-14-0006 Capability issue in Chat
MSA-14-0007 Access issue in Wiki
MSA-14-0008 Cross site scripting potential in Flowplayer
MSA-14-0009 Identity information leak in Forum and Quiz
MSA-14-0010 Identity information leak in Alfresco Repository
MSA-14-0011 Cross site request forgery potential in IMS enrolments
MSA-14-0012 Access issue in Badges
Fixes and improvements
MDL-40705 - Long course names are truncated in navigation menu
MDL-40205 - Long block titles are truncated in Clean
MDL-42882 - Performance improvement to missing root directory upgrade step
MDL-40849 - Assignment marking guide screen fixed in Clean
MDL-44217 - The link colour in Bootstrapbase (and Clean) is now WCAG compliant
MDL-44029 - Quiz user overrides no longer deleted by group event handler
MDL-44018 - Variant field of question_attempts is backed up by Moodle backup
MDL-43941 - Activity show/hide toggle fixed in hidden and orphaned sections
MDL-43306 - Backup no longer introduces duplicate gradeitem sortorders when restoring

2.5.4
Highlights
MDL-41819 - Able to edit a larger number of grades in the grader report
Functional changes
MDL-42504 - Quiz auto-save detects that the connection to the server has been lost and warns students
API changes
MDL-40741 - Behat tests adapted to Clean theme
MDL-42942 - Environmental information shown at the beginning of every Behat run
Security issues
MSA-14-0001 Config passwords visibility issue
MSA-14-0002 Group constraints lacking in "login as"
MSA-14-0003 Cross-site request forgery vulnerability in profile fields
Fixes and improvements
MDL-34182 - Invalid JSON no longer output on filepicker when repository plugins output invalid content
MDL-43367 - get_child_contexts() returns correct contexts when context path missing
MDL-42913 - Group cache works as expected
MDL-40003 - Assignment submission comments are restored
MDL-42085 - Default enrolment duration is now applied when manually enrolling a user

(wen)