make documentation in IPC/Run3/ProfReporter.pm comply with
older versions of Pod::Coverage (fixes bug #15749)
new version of t/fork.t that will work on Windows
(there are still unresolved issues on Cygwin)
switch t/fd_leak.t to use Test::More and relax file descriptor check
to "same or fewer fd's after the call to run3 than before",
because Darwin 7.2 sometimes actually report fewer fd's
(fixes bug #15741)
extricated some dead code from IPC/Run3.pm that
resulted in 6 unused file descriptors
fix call to binmode missing a filehandle in IPC/Run3.pm