[S06] more elaborate $*OUT/$*ERR selection for USAGE printing
[S06] more elaborate $*OUT/$*ERR selection for USAGE printing

This should make both avar++ happy who wants './prog --help|less' to DWHM,
and also TheDamian, who wants in good UNIX tradition a pipe of the form
'./prog | sort > file' to print usage messages to $*ERR to catch mistakes.

git-svn-id: 53605643c415f7495558be95614cf14171f1db78@31190 c213334d-75ef-0310-aa23-eaa082d1ae64

tokuhirom/specs,prammer/specs,perl6/specs,tokuhirom/specs,perl6/specs,prammer/specs,tokuhirom/specs,prammer/specs