many PHPDocs
some unused variables
some dynamically declared variables declared

Added support for external video and audio files

added filter method to INPUT class

clean user credentials from control chars

Last Update Date info of extension fix

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* origin/auth_getUserData_improvements:
  KISS - remove class constants for REQUIRE_GROUPS & IGNORE_GROUPS and replace with boolean values
  use $requireGroups constants in auth classes; comments; code improvements
  fix comment errors, sp. & grammar
  code styling - add missing braces
  Allow user info to be retrieved without groups
  Restore correct public interface of getUserData() for authldap plugin

Conflicts:
	inc/common.php

improve qsearch suggestions

Adding X-Forwarded-Proto support

* origin/pr/814:
  translation update

Conflicts:
	inc/lang/ta/lang.php

Added @ALL handeling in auth_isMember

When a username but no password is submitted, the login is denied right
away instead of relying on the backend to refuse the login.

This is to prevent zero byte attacks on external auth systems as
described in
http://www.freelists.org/post/dokuwiki/Fwd-Dokuwiki-maybe-security-issue-Null-byte-poisoning-in-LDAP-authentication

the filter() function can be chained between the accessor and the value
function to get a filtered value. When no filter allable is given in the
filter() function, stripctl() is used to strip all control chars (ASCII<32)

Examples:

  $INPUT->post->filter()->str('foobar');
  $INPUT->get->filter('myfilter')->int('baz');

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