Please cherry-pick:

Please cherry-pick:
- isEmailAddressRegistered() should always, like other public methods, validate
  their parameter
- introduced isCompanyNameUsed() which is similar to isEmailAddressRegistered()
  which will be used to check in JS107 cache if company name is already used
- make sure only non-null email addresses are added to emailAddressCache
- updated/changed copyright to Free Software Foundation
- added TODO to get rid of generateRandomUserName() business method is which
  deprecated anyway
- removed isPublicUserProfileEnabled()
- AdminBranchOfficeWebRequestBean is surely a request-scoped backing bean
- added to same bean properties for last house number and extension of branch
  office
- renamed bean field employeePersonalContact -> employeePersonalData
- fixed some leftovers from duplication of branch office controller for employees
- same with department bean
- used more MessageFormat.format() which prevents more String objects polluting
  both heaps
- injected feature backing bean into admin user bean
- added missing bean property for user's profile mode to same bean
- introduced private method createUserInstance() to same bean
- null-ed more fields in same bean in clear() method
- fixed imports of ContactUtils -> Contacts
- AdminHeadquarterWebRequestBean is surely a request-scoped backing bean
- added to same bean properties for last house number and extension of
  headquarter
- fixed some leftovers from duplication of branch office controller for headquarter

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