blind player updates (trunk only)

blind player updates (trunk only)

This takes the PC config file commented symbol value
recommendations from <Someone> for blind players
and puts them into a symset.

[note to devteam: They look odd. I thought perhaps that
something was code wrong, but I went back to 3.4.3
and uncommented the config file stuff. They look the
same there, still odd, especially corridors.
Does anyone have any of the e-mail from <Someone> that might give an indication of what is supposed
to be seen on the display?  I wonder if those config
file options fell out of synch with the code long ago]