Please cherry-pick:

Please cherry-pick:
- switched converters/validators which are converting primary keys (id numbers)
  into entities from EJB-based lookup to backing-bean-based lookup as this is
  much better performing (EJB calls are relative "expensive")
- the backing bean will then check cache which is basically a distributed Map
  (Cache interface) where the primary key is also the key for cache entries
- a SomeEntityNotFoundException is being thrown when containsKey() returns
  false which is then caught by the calling method
- fixed imports from "renaming season" ;-)
- renamed contactsCache -> contactCache as other caches are named same way
- no need for company employee, basic data, branch offices and departments

Signed-off-by: Roland Häder <roland@mxchange.org>