Update Course Form to create main section for courses with no lab/tutori...

...al/child sections

Changing 'back' to this so that enrollment script can enroll students to the d100 section. Not easily possible to enroll to default section because cannot easily set SIS ID.

Best if @va7map (Andrew) can review this code before pulling this. It's not critical to have this in the next code deploy before Spring2014 term start since the Section Tutorial API fix should workaround this issue.