Add FirePHP to Mapbender

[christoph]

FirePHP is a useful tool for debugging, see ​http://www.firephp.org/

You can, for example, log stuff in PHP and display it in Firebug. It is non-obtrusive, as it uses HTTP headers to transfer the data (no IE problems).

It is especially useful in scenarios where you have no access to your remote server: then FirePHP will re-route server side errors to Firebug.

It is of course a potential security hazard, so it should be turned off in production use (is turned off by default).

[christoph]

trunk

​http://trac.osgeo.org/mapbender/changeset/4781