Update check availability module to use autocomplete.
Some fixes to previous commit.

Fix edit availability page submit. Fix link back to check availability page.
Merge branch 'main' into issue757

Conflicts:
	esp/esp/program/modules/handlers/availabilitymodule.py
	esp/templates/program/modules/availabilitymodule/check_availability.html
Check availability: use AjaxForeignKeyNewformField for search field.
Make same change in last commit to medical bypass page.

Also fixes a minor display bug.
Merge pull request #761 from learning-unlimited/issue757

Update check availability module to use autocomplete.