Only remove the Authorization / Proxy-Authorization header from the

Only remove the Authorization / Proxy-Authorization header from the

	* libsoup/soup-message.c (soup_message_set_auth)
	(soup_message_set_proxy_auth): Only remove the Authorization /
	Proxy-Authorization header from the message if it was previously
	set by soup_message_set_auth(). (Eg, not if it was added by
	SoupConnectionNTLM.) #471389

	* libsoup/soup-connection-ntlm.h: fix a search-and-replace-o

	* tests/ntlm-test.c: Simple NTLM regression test; doesn't really
	test the crypto/encoding bits, just that the right headers are
	being sent at the right times.

svn path=/trunk/; revision=930