(strings to switch color) for ANSI_DEFAULT. Instead of lumping
more conditional code into tty_shutdown() I put the new code
into a separate routine and also pulled the existing setup code
out of tty_startup() into a separate routine too.
It will be a miracle if this doesn't break anything due to the
crazy amount of convoluted conditionals present in termcap.c.
On the other hand, I found and fixed a bug while trying to test.
The ANSI_DEFAULT hilites for Gray and No_Color were null instead
of an empty string. MS-DOS stdio apparently fixes that up, but
on OSX (after #undef UNIX and TERMLIB and TERMINFO and #define
ANSI_DEFAULT in termcap.c) I started seeing instances of "(null)"
on the map (OSX stdio does a different fix up for Null pointers)
as soon as I enabled 'color'. It was an attempt to set No_Color.
Closes#411
e7e07cb067