MDL-10181 User Management Improvements: Cron unenrolment of manual should takes place...

MDL-10181 User Management Improvements: Cron unenrolment of manual should takes place in the main cron.
It is time to use own enrolment method when calling funcs enrol_into_course, role_assign, role_unassign.

Zend Studio Warning: Assignment in condition (line XX), Solved, one more ()
Assignments in a conditional statement are sometimes the result of a typo.
In many cases, instead of the assignment operator =, the equality operator ==
should be used. When comparing a variable and a non-variable expression,
it is common practice to put the variable on the right-hand side of the equality
operator, so that if the equality operator is erroneously replaced with the
assignment operator, PHP will report a parse error immediately.
This helps you avoid a big subset of this class of bugs.

Merged from MOODLE_19_STABLE