Spot a call locally and wipe when the radio moves far on a QSY

With a call in the entry window, a move of more than 2 kHz on the same
band puts the call on the bandmap where it was heard and wipes the boxes,
as N1MM does. The spot goes to the other stations as ADDSPOT and to the
Spots broadcast, never to the cluster. ADDSPOT from other stations is
added to the bandmap.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

docs/unfinished.md

@@ -443,7 +443,18 @@ Anything over two seconds is called out.
 **The master** is the station the entry follows for cluster spots and the time,
 set from the station list and told to everybody, so the `Master` column agrees
 everywhere. What it does not do yet is relay: N1MM's master passes its cluster
-spots to the others over the link, and `ADDSPOT` and `PACKET` are not written.
+spots to the others over the link, and `PACKET` is not written. `ADDSPOT` is
+written and read, but only for a local spot made on a QSY (see below); the
+master does not relay its cluster spots with it.
+
+**Local spot on a QSY.** With a callsign in the entry window, the radio moving
+more than `QsySpotHertz` (default 2 kHz, N1MM's value) on the same band puts the
+call on the bandmap where it was heard and wipes the boxes. It sends `ADDSPOT`
+to the other stations and a Spots broadcast, never a cluster spot. Nothing
+happens while running, in quick edit, with a complete exchange, with a number in
+the box, or when the bandmap already has the call there. N1MM's other
+trigger, a dupe left behind by a move of 0.1 kHz or more, is not done. There is
+no dialog for the distance; it is in the settings file.
 
 **Call stacking.** A callsign heard at one station and handed to the position
 that will work it: `STACKANOTHERCALL` with the call alone, `STACKCALL` with the