MDL-38794 passed overflowdiv parameter
MDL-37804 mod/assign: Students no longer able to submit files after due date with Prevent late submissions turned on.
MDL-40262 theme_formal_white: I simply assigned black (that is well contrasted according to http://snook.ca/technical/colour_contrast/colour.html) to links and white (that makes a not compliant contrast with background color) to plain texts in the breadcrumb. This is the less expensive solution I found to differentiate plain text and links and have links well contrasted.
MDL-41117 theme_formal_white: fixed border around header of course categories and sub-categories
MDL-41146 Backup: backup_includes_files can leak memory
Automatically generated installer lang files
Automatically generated installer lang files
Automatically generated installer lang files
Automatically generated installer lang files
Merge branch 'master' into install_master
MDL-41418 Administration: Page context should be set before setting page title
MDL-41369 Set proper context and navigation path for user messages
Automatically generated installer lang files
MDL-41438 core_renderer: Update the parameters for heading() and heading_with_help().
heading(), change the default value for classes from 'main' to null.
heading_with_help(), add 2 additional parameters for level and classnames. Default value of level is set to 2 and classnames is set to null.

With the changes for heading_with_help(), icon image vertical alignment needs to be adjusted, so it display in the middle of the heading.

Also added some notes in theme/upgrade.txt file.
MDL-41438 core renderer: additional patch to remove .main definition from all core themes
MDL-41485 calendar: Replace value of action buttons on managesubscription page with int
MDL-41497 enrol_database: Added help text for using odbc dsn names instead
Automatically generated installer lang files
MDL-41456 Events: Fixed existing events to respect base event access specifier and return data type
MDL-37028 Integrity check for course modules and sections

created function, unittest, build-in quick integrity check on each call to rebuild_course_cache()
also added CLI script