Added support for search in studentlist

Now works with pagination. Also fixed the studentview ajax call.
Fixed quiz selection in sectionlist
Pagination+search should now work for accesslist
Fixed updating of accesslist + security
Fixed support for different gradesystems
Bugfixes
Small fix
Fixed sectionlist styling once again

Please do not override these changes, as it will make the sectionlist
cogwheel look messed up.
Merge branch 'duggasys-Quiz' into duggasys-feature-eventlog