Here are a few minor fixes to Postgres95.  Mostly I have added const
to some of the char pointers.  There was also a missing header file
and a place where it looks like "==" was used when "=" was meant.
I also changed some variables from Pfin and Pfout tp pfin and pfout
because the latter shadow global variables and that just seems like
an unsafe practice which I like to avoid.

Submitted by:  "D'Arcy J.M. Cain" <darcy@druid.druid.com>