Some auth plugins used to have a mix of the legacy style of plugin names
in config_plugins table (such as 'auth/mnet') and the new correct
style (such as 'auth_mnet'). Attempting to rename the setting plugin via
low level SQL UPDATE could lead to duplicate key violation.
The patch introduces a new helper function to safely migrate the old
settings to the new ones, eventually informing the admin about the
values mismatch.
This just deletes all the upgrade steps previous to 2.7.0. Some
small adjustments, like adding missing MOODLE_INTERNAL or tweaking
globals can also be applied when needed.
Next commit will get rid of/deprecate all the upgradelib functions
not used anymore in codebase.
This patch fixes incorrect password creating, updating and resetting, updating of user fields, unsupported auth plugins are correctly identified, modification of mnethostid is prevented, fixed problem with email duplicates, new password is generated for users without email, etc. It also includes coding style improvements, more inline docs, future TODOs and license information.
