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.
Sheduled tasks for syncing users with external sources for auth_ldap
and auth_cas. Using task is simplier than setting separate cron
job for running cli script. Task are disabled by default.
This has been introduced in 2.5, so when upgrading from previous versions
make sure we set a default value. Otherwise, we get a notice about it
being undefined when we try to use it (and we always try to use it!).
They now share most of the code again, this time via subclassing, and they
share some code with enrol/ldap. They have also gained some features and a few
fixes.
