Merge branch 'release/2.1.3' into develop
Bumped version for development after release
Fixed visibility of external teachers application link. Closes #365
Merge pull request #366 from samfcmc/feature/link_external_teachers

Fixed visibility of external teachers application link. Closes #365
Bug fix: Closes #367
- when a degree had not previous enrolment periods it wasn't possible to
create new enrolment periods for that degree
- the access validation was being made inside the cycle which resulted
in the above behavior and it is not necessary to validate that in every
iteration
Automatically init period with information from previous year. Allow delete of empty periods.
Bumped version for release of 2.1.4
Merge branch 'release/2.1.4'