Please cherry-pick:

Please cherry-pick:
- removed company from "basic_company_data" (and class names) as there will be
  no other basic data
- added view for headquarter listing (administrative)
- used more beanHelper's renderFoo(foo) methods as this is much easier to debug
- renamed ADMIN_SHOW_PHONE_NUMBER to ADMIN_SHOW_<FAX|LAND_LINE|MOBILE>_NUMBER
- added menu for headquarters (administrative)
- added custom JSF tag for administrative "mini-links" for headquarters
- added templates for form and opening times of headquarters
- fixed employee link outcomes, was copy-paste mistake (ops)
- renamed more headquarters -> headquarter
- addEmployee() is now "basically finished"
- changed h:outputLink to p:link which suits better here
- added missing navigation rules for headquarters/employees
- isCompanyNameUsed() and isEmailAddressRegistered() should be "basically
  finished"
- still one isEmailAddressRegistered() is left in generic contactController
- first value, then variable on comparison (null == someVariable)
- lot's more fixes/improvements I cannot remember ...

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