added methods from xmlrpc.php to RemoteAPICore

transfered bugfix from dokuwiki 97a000f0551735b35606d94d59abc4ff440783a5

use in_array to filter groups instead of preg_grep for acl

the usage of preg_grep can result in "regular expression is too large"
warnings, which leads to errors in auth_aclcheck.

Revert 4a24b459, thus fixing FETCH_MEDIA_STATUS for missing files (FS#2405)

Fix double URL-encoding in media manager (FS#2403)

Slight fix to match current version.

Rework for missing commit 08162f005f3ced0555de590dc1a53155af99d998

Rewark for missing commit 9aa0e6c6087e616511fc95d1650ca9b608edece8

Malay language update

Polish language update

Avoid a warning when a media cachefile doesn't exist yet

changed to new Remote Data objects

updated GPL2 license text (fixes whitespace issues and typos and updates FSF address)

Fixed bug in XML-RPC search.

The score was randomly transfered as string or as integer.
This way it will always be transfered as an integer.

changed return types

added remote plugin calls.

RemoteAPI can now handle remote calls.

Dutch language update

Norwegian language update

Add missing German language values (config plugin)

fixed whitespace error introduced with 475aa19

Added urldecoding of query for qsearch

fixed link in popup media manager to fullscreen media manager to open in correct namespace (FS#2401)

fixed list type being sometimes undefined

fixed mediamanager diffs having no specific height (FS#2387)