Lower-case

[RWK at MIT-MC (Robert W. Kerns)]

I'd always heard that UPPERCASE WAS EASIER TO READ.  It depends heavily
on your font, but it's definately true (subjective opinion) on a VT52.

Yet, I do find lower case more aesthetic.  But you don't want to make
how things print be different from the default read syntax, and you do
want to make it possible to FORCE things to print with upper-case (with
slashification if necessary).  Thus you must either change all the atoms
to use lower-case instead of upper in their PNAMES (which will affect,
if not break, everything using EXPLODE etc.)  Else lower case must be
represented as upper case internally, and slashified upper case be represented
as lower case internally, and then invert them on output.

I think the best way to implement this change is with careful aplication of
a time machine.