* func-proto.h (krb5_mk_req(), krb5_mk_req_extended(), krb5_rd_rep(),

	* func-proto.h (krb5_mk_req(), krb5_mk_req_extended(), krb5_rd_rep(),
		krb5_sendauth(), krb5_mk_priv(), krb5_rd_priv(), krb5_mk_safe(),
		and krb5_rd_safe()). Added a krb5_auth_context argument and
		eliminated many of the other arguments because they are
		included in the krb5_auth_context structure.

	* fieldbits.h Added #define AP_OPTS_USE_SUBKEY 0x00000001 for a
		new option to an ap req message. This is mainly a clean way
		to inform krb5_mk_req() and krb5_mk_req_extended() to
		create the subkey without adding an extra argument.

	* safepriv.h Replace safe/priv flags with flags for krb5_auth_context
		and add krb5_replay_data structure for when the appilication
		want to do it's own replay detection for safe and priv calls.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@5095 dc483132-0cff-0310-8789-dd5450dbe970