plain 0 should be used. This happens to work because we #define
NULL to 0, but is stylistically wrong and can cause problems
for people trying to port bits of code to other environments.
PR: 2752
Submitted by: Arne Henrik Juul <arnej@imf.unit.no>
"begin [0-7]* *". Now `begin with, ' is not a header line.
Do a boundary check for body characters. Characters less than 33 or
greater than 96 are out of range. If characters are out of range
uudecode print a error message and die.
