Explicitly document the fact that you have to call soup_uri_set_path()

Explicitly document the fact that you have to call soup_uri_set_path()

	* libsoup/soup-uri.c (soup_uri_new): Explicitly document the fact
	that you have to call soup_uri_set_path() when using
	soup_uri_new(NULL), since path is required to be non-%NULL.

	* libsoup/soup-connection.c (connect_message): initialize
	uri->path

	* libsoup/soup-cookie.c (soup_cookie_applies_to_uri):
	g_return_val_if_fail() rather than crashing if uri->path is %NULL.
	Also, fix the cookie/uri path comparison to not potentially read
	off the end of uri->path. #562191, Mark Lee.

svn path=/trunk/; revision=1221