added new employee termination reason "Μετάταξη"
fixed some issues with new employments
gh-130 : fixed improper handling of ENTRY_INTO_SERVICE_DATE &
ENTRY_INTO_SERVICE_ACT propagation during school year upgrade for
transfers (WITHIN_PYSDE) and improvements.
fixed an NPE in WorkExperienceCalculation when the employee had no
current employment
removed old pension scanner
updated Employee toString() to contain the employee id.
removed PENSION_SYNC_INTERVAL from  SchedulerController
gh-167 : manual καταγραφή υποχρεωτικού ωραρίου.