Use Composer PSR-0 class loader for unit tests. Refs #2293
RequestInterface $path parameter in spawnRequest() has been DEPRECATED..
Start detached process inside a ptrack wrapper. Refs #2029
Reload current page on AJAX 403 (Forbidden) errors. Refs #944

Forces the reload of the current page if an AJAX call returns HTTP 403
status code, after the user has been notified of the error condition.
Use phpInclude() wrapper to catch include WARNINGs

Catalog loading warnings are suppressed.
JS client: Try to repeat a failed request, if possible. Refs #2029

FIXME: this must be done only for GET requests!

The request can be repeated if the connection fails, or if the
response is temporary (404).