Continued with #3010:

Continued with #3010:
- removed added debug messages (maybe they will come back in accordance to
  code-style guidelines?)
- converted $a->get_baseurl() back to App::get_baseurl()
- reverted back other code I have touched/merged as this was double:
  (substr($url, 0, 4) !== 'http') on $url = 'https://bla'; will be FALSE
  (means found http at start), too.

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