CONTRIB-4238 cycle through all course sections regardless of modules
CONTRIB-4238 add ability to manage topic dates
CONTRIB-4238 manage all section dates even if unset
Merge pull request #5 from mackensen/CONTRIB-4238-master

Contrib 4238 master
Reports: 2.7 compatibility + Behat tests #11736, #11737, #11738
Fix unit tests so they work in Moodle core.
Fix collatorlib -> core_collator.
Bump the version number for the 2.3 release.