FileCache - keep more files open than the system permits
cacheout $path;
print $path @data;
The `cacheout' function will make sure that there's a
filehandle open for writing available as the pathname you
give it. It automatically closes and re-opens files if
you exceed your system file descriptor maximum.
sys/param.h lies with its `NOFILE' define on some systems,
so you may have to set $FileCache::cacheout_maxopen your
self.