Removed Bolonha 1st cycle degrees from incoming mobility programmes options.
Added support for modifying a student's mobility programme.
Modified criation of incoming mobility vacancies to allow the creation of multiple vacancies at the same time
Added support for modifying a student's chosen degree.
Closes #522
Closes #525: Modified exported xls file to include username and separate each field in a different cell
Removed commented code on line 407
Minor change: this restriction no longer applies
ThesisReadersGroup now contains all thesis participants, including the student
Merge pull request #537 from cbartol/ticket/rt#419425

Fixed the access group to the thesis file
Minor change: added missing labels
students who are no longer active members still belong to execution courses that they attended.
Merge pull request #539 from cbartol/ticket/rt#420708

Alumni have now access to the content of execution courses that they attended.
Minor change: change the role type to the correct one
Merge pull request #524 from AfonsoFGarcia/externalCandidacies

Removed Bolonha 1st cycle degrees from incoming mobility programmes options.
Added support for modifying a student's mobility programme.
Modified criation of incoming mobility vacancies to allow the creation of multiple vacancies at the same time
Added support for modifying a student's chosen degree.
Closes #522
Merge pull request #526 from AfonsoFGarcia/ticket/418569

Closes #525: Modified exported xls file to include username and separate each field in a different cell