Change sigTTOU/TTIN to IGNORE by default

[Volker Stolz]

My local copy of ghc-4.08.1 likes to stop a program when running it
with "&" (nohup) by default, I have to call
  Posix.installHandler Posix.sigTTOU Posix.Ignore Nothing
first to get the desired behaviour. However, my local copy of
Stevens´ "UNIX Network Programming" says:

"SIGTTOU: [..] By default a background process is allowed to write to
its control terminal, but you can specify that a background write is to
generate this signal instead."

In other words: Unless I´m setting setting this signalhandler myself to
block me and didn´t notice it or ghc is plainly wrong.

In the latter case SIGTTIN should be changed, too.
-- 
\usepackage[latin1]{inputenc}!
Volker Stolz * stolz at i2.informatik.rwth-aachen.de * PGP + S/MIME