6.0pre2

Much simplified the syscall interface by disabling libmon and instead
calling the syscalls directly. Disabled the K&R C compiler and libc because
it doesn't actually gain us anything and has a high maintenance load --- the
ANSI C compiler works fine with K&R C. Adapted the rest of the system to
build with the ANSI C compiler. Rewrote the pc86 syscall interface and added
linux386 support, using the i386 code generator. Lots and lots of bugfixes
and tweaks everywhere.