Changes to troffcvt distribution for release 1.03.

Distribution is now configured with the WRPRC2 (Release 2) imake
configuration files, not the WRPRC (Release 1) files.

troffcvt:
Doesn't announce when it's reading from stdin anymore.  This
reduces stderr noise for other programs that invoke troffcvt and check error
output to see if it's empty or not.

AWriteText() had an infinite-loop bug.

Added several special-char's from Dave Davey.

tc2rtf.c:
Two of the variable initializations (lineLen, pageWid) were changed to
cope with dumb compiler that doesn't allow integral variables to be
initialized from non-integral expressions.

cs-argument parsing didn't pick up first character of charset name (off-by-one
error).

troff2rtf:
Passes -troff to troffcvt now.

Fixed bug in passing rargs to tc2rtf.

Added several special characters from Dave Davey to rtf-spec-mac.

unroff:
Passes -nroff to troffcvt now.