Please cherry-pick:

Please cherry-pick:
- added new stateless session beans for administrative and general purposes for
  branch office data and implemented business methods
- moved allCompanyBasicData() to general bean as this is a general business method
- also had to switch EJB references (maybe one day lookup="" is required again?)
- added private method isContactFound() to check if contact is already registered
  or not there
- this method is now used to throw proper checked exceptions (which in turn your
  application must catch)
- implemented business method allCompanyBasicData()
- renamed getAllContacts() -> allContacts() as this is actually no getter
  following naming-convention
- renamed getUserNameList() -> allUserNames() for same reason
- in fillUserData() added more checks on parameter 'user' as usual in many
  places, including ifUserExists() and throw checked (wanted) exception if not
  found in persistence provider
- added 'final' whereever possible, better optimization
- used not NULL when not needed, allowing more 'final' to be set
- updated persistence unit (new namespace for branch office entity)
- relicensed under Affero GPLv3 (no change to e.g. MIT will happen)
- added TODOs

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