Show a domain dropdown when multiple AD domains are configured

This integrates the functionality of the now outdated addomain plugin
directly into the authad plugin and makes multi-domain setups usable
without SSO.

See also https://github.com/cosmocode/dokuwiki-plugin-addomain
add missing '&' before 't' in url construction
make media links in rss feeds absolute

This resolves issues with broken images when the wiki feed is
hosted by third parties (e.g. FeedBurner), as mentioned in
FS#2931 comments.
use http_sendfile correct
FS#2388 give relative path to sendfile on nginx
Add FULLTEXT_PHRASE_MATCH event for allowing plugins to match phrases

Our index doesn't support phrase searches so we are searching for the
pages that contain all words of the phrase and then search again in the
content of the pages. As plugins can also add additional text to the
index this event allows plugins to do phrase matching in their content.
fixes possibility of a user password change being sent out when a password couldn't be/wasn't changed
add braces and indentation per coding standards
add password confirmation field when setting password in the usermanager
user global  strings for password confirmation prompt & error
Switched file icons against generated ones, added 32x32 versions
Add dynamic declared _time attribute to cache object
add visibility keywords and PHPDocs for cache
Merge remote-tracking branch 'origin/master' into cachetimeattr
cleanup PHPDocs: DokuWiki_Syntax_Plugin is a DokuWiki_Plugin as well
PHPDocs for Doku_Event and handler
PHPDocs of cache classes
Improve PHPDocs pageutils
PHPDocs form
PHPDocs js.php