add underflow checking, and intelligent SIGFPE errors if opt('t')

merge pdx into the Pascal system

add storage classes to namelist, and use them.

fix so that /lib/c2 does not break profiling

dynamically allocate display save areas before formal calls

correct errors on delta 1.4

add sextname() to make up long external names for things.

mods for new formal routine syntax

add temporary register allocation

date and time created 81/03/11 14:10:48 by mckusick