This adds a new parameter to ft_backlinks() to ignore permissions which
is needed for invalidating the cache of linking pages with useheading
enabled. This also adds various test cases for ft_backlinks().

adding ACL handlers to xmlrpc

The POST data contained the raw data instead of an array with the data
that should be submitted like in the requests from the browser. The
server backend has been fixed to be able to process both versions.

the _redirect function is not used in DokuWiki anyway

add newest plugin types to info plugin

Add media_isexternal

Added comment to DiffFormatter _escape() method

FS#2415, add $INFO to mediamanager

AUTH_PASSWORD_GENERATE event added

reloading the user list after the delete action will make sure the count
is always correct.

If you want better random initialization and more control over the
password strength install the passpolicy plugin.