V10/cmd/spitbol/mods

changed flush.c so as not to flake out when flushing an unbuffered file

changed swcoup.c and osopen.c to use mode 0666 when creating files.
	If the user desires more protection, umask is the right way to go.

made host(4,"x") return value of environment variable x

changed osint.s to relocate flptr by new-old stack over load module
	write/read.  changed header.s to make flptr global.

changed osopen.c to make buffered input (but not output) the default
	on tty-style file.  Original code:
		if ( testty( fd ) == 0 )
	Modified code:
		if ( (ioptr -> flg & IO_INP) == 0 && testty( fd ) == 0 )