It was toggling the state of the hidden input - not the checkbox.

Thanks to Francois Gauthier for report/fix.

Optional features and warnings may be added later,
but we need at least required environment for 2.5.1

This includes database family cleanup and more realistic memory requirement.

Update LTI mod form so checkboxes always submit their value.

Merge branch 'w22_MDL-25031_m22_blockupgrade' of git://github.com/skodak/moodle into MOODLE_22_STABLE