[PreMigration][Bugfixes & Features] ExecutionCourseManagement:
- New rules: only one ExecutionCourse allowed for each CurricularCourse
- Insert Execution Course
- Create Course Reports For Execution Period
- Create Execution Course for Degree Curricular Plan
- Edit Execution Course:
--- Labels, nav buttons, more information;
--- Associate, Dissociate;
--- Move Announcements, Separation (already on production), Delete
- Professorship deletion restrictions more informative.
---- (revealed by ExecutionCourseMerge)
[PreMigration][Features] ExecutionCourseManagement.
 - New interface for CC Associations + EC Separation
 - CreateExecutionCourses now prints number of ECs created per degree.
ExecutionCourseManagement: Final corrections
Merge branch 'feature/ExecCoursesManagementMigration'.
PreMigration ExecutionCourseManagement from Admin to Academic Admin: bugs corrected.