Added PREF_OTR_POLICY to preferences.c -> key -> otr.policy

Added default value "manual" to PREF_OTR_POLICy -> preferences.c
Modified help string to reflect otr_policy, started checks on cmd_otr

src/otr/otr.c

@@ -421,6 +421,7 @@ _otr_get_their_fingerprint(const char * const recipient)
 static char *
 _otr_encrypt_message(const char * const to, const char * const message)
 {
+	return NULL;
     char *newmessage = NULL;
     gcry_error_t err = otrlib_encrypt_message(user_state, &ops, jid, to, message, &newmessage);