and make changes to mysql users in the mysql plugin module.

Refs: 1722

Also removed the calls to the db closeConn calls in favor of
destryong the connections on the class __destruct() 's..

Since firebird db had a closeConn as well, changed its __destruct
to calls its own personal closeConn which otherwise left unmodified.

Refs: 1722

1) Added DEVSYSTEM define in config.inc.php.master  defaults to 0
  If set to 1 classes can load as symbolc links, server.php now

2) server.php now resolves its require()ed files with an absolute
   path instead of relative.

- replace double-quotes with single-quotes whenever appropriate

Added a missing language string in server config form.

- fixed a php notice in app.inc.php

- Changed the default settings for websites

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