MT#6195 API rwr: Give proper reseller access

see also MT#6479
MT#6493 Start years selection in 2014
MT#6511 Bump Standards-Version to 3.9.5
MT#6513 remove old Replaces/Breaks. Not needed any longer.
MT#6551 Cleanup Build script

- remove action test_tap
- only start server on "--run-server"
- make "--webdriver" optional
- remove Sipwise::Base from configure-requirements
MT#6551 Getopt allow unknown options

to pass through to Module::Build, for example "--verbose"
MT#6551 Add empty MANIFEST file

so perl Build.PL does not complain about that
and skip everything in MANIFEST.SKIP
MT#6559 remove usage of CLASS

so in a future step we can remove this from
Sipwise::Base
MT#6295 fix api-root test

Update currently available links
MT#6295 API: fix failing customers and contracts requests

validate max_subscribers (like in earlier versions) but don't
require product to be set
and typo
MT#6295 API: allow tests without invalid/unauth cert

which are (for now) difficult to get on test machines
MT#6497 API: get callforwards (simple)
MT#6497 API: edit callforwards (wip)