Record all old-style formatting options, and the full string for the extra display spec, in the control structure; make pv_remote_set only use internal pv state structures so it can be part of the internal pv library where it belongs, and not need to know about main()'s options array.

src/include/options.h

@@ -31,6 +31,7 @@ typedef enum {
 	PV_ACTION_TRANSFER,		/* transfer data */
 	PV_ACTION_STORE_AND_FORWARD,	/* store to file, then output from it */
 	PV_ACTION_WATCHFD,		/* watch process file descriptors */
+	PV_ACTION_REMOTE_CONTROL,	/* remotely control another pv */
 	PV_ACTION_QUERY			/* watch the state of another pv */
 } pvaction_t;