Author: Mark Nielsen
MDL-32690: Restore 1.9 backup into 2.X fails on missing assignment type
Solution is as follows:
* Allow unsupported subplugins to convert from Moodle1 to Moodle2
* On Moodle2 restore hide unsupported subplugins
* Graceful error message in assignment of unsupported subplugins
http://git.moodle.org/gw?p=moodle.git;a=commit;h=0fc55f1d0aa2ee448e955c5fdd35198fdca7d4ba
http://github.com/moodle/moodle/commit/0fc55f1d0aa2ee448e955c5fdd35198fdca7d4ba
+ 2.4 en [unsupportedsubplugin,mod_assignment]