getpos moving to 'cmap' characters

getpos moving to 'cmap' characters

While testing something I noticed that moving the cursor to visible '^'
by typing '^' while getpos was asking me to pick a location, it didn't
always cycle through all visible traps.  The most straightforward
culprit was after trap detection (via confused gold detection, not ^F)
had found a trap door or level teleporter in a closet that itself was
a secret corridor spot.  But it turned out to be any location that
hadn't been seen yet.  This is a substantial overhaul of the relevant
code and so far works for all the cases I've tried, but there are
bound to be cases I haven't tried yet and those may or may not work
correctly.

There's also a bunch of formatting cleanup, and some simplification of
the m/M/o/O/d/D/x/X handling.