the URL RFC says the port must be numeric, so we don't want to do

the URL RFC says the port must be numeric, so we don't want to do

	* g_url_new really wanted to take a CamelException. So, rename
	Gurl to CamelURL, g_url_* to camel_url_* (with camel_url_new
	taking an exception), and url-util.[ch] to camel-url.[ch]. Also
	force url->port to be numeric and remove camel_service_getport. (I
	was confused before: the URL RFC says the port must be numeric, so
	we don't want to do getportbyname.)