Rename Table Course-Requirement

[BernalF]

++ Rename Table Course-Requirement => CourseRequirement |-> Tabla: Plan-Course, remove PK's (FK) and add PK PlanCourseID |-> Tabla: CourseRequirement,

• remove CourseID
• Add PlanCourseID as FK
• Add CourseRequirementID as PK |-> Verificar contra el flag de actas si se esta aprobado o reprobado |-> Opcion Menu: Vincular Requisitos por Curso
• Filtro Plan + Filtro Curso