MDL-38102 lib: Check for null return value from password_hash function call
MDL-38555 forms: Prevent same data submission multiple times.

This disables Submit button when the form has been submitted to
prevent consequent submissions before the page has been loaded.
MDL-38545 Reports: PHP Strict Standards error in graph.php
MDL-38480_m Fix for messy usage of language strings in block course overview
MDL-26120 mod_forum: use correct object
MDL-32898 Final deprecation of moodle_strtolower()
 MDL-34508 Formslib: Removed deprecated setHelpButton() from editor.php and hidden.php
MDL-33379 course: Removed deprecated move_section() from course/lib.php
MDL-35666 remove uninstall protocol option
MDL-39166 auth_ldap Add triggers for user created/updated events.
MDL-39399 theme: Missing expand/collapse icon in clean
MDL-39399 theme: RTL styles for collapse/expand in forms
MDL-39363 scorm: Accept 0 as a valid score
MDL-39409 auth/cas pass web proxy settings along to phpCAS
MDL-39040 - mod_data: Database description available in add entry tab.
MDL-39040 - mod_data: Database description available in single view tab.
MDL-39435 feedback: Fix missing calls to setType
MDL-38714 Lesson module: add setType for hidden and text inputs
MDL-38500 repository: Instance names must be unique
MDL-38315 Completion: Bugs with 'locked' status in activity form