'RELENG_7_0_0_RELEASE'.

This commit was manufactured to restore the state of the 7.0-RELEASE image.

	- Use foo(void) instead of foo().
	- Use static where applicable.
	- Apply more const's when passing parameters
	- signed/unsigned madness
	- Avoid namespace collision by adding underscores.
	- For 64-bit architectures, use %zx instead of %x
	  when necessary.
	- When storing constants, use const instead of
	  variable.
	- Bump WARNS?= from 2 to 6

- MAN[1-9] -> MAN.

life easier if a PS/2 mouse locks up the keyboard (frequent-ish,
but not repeatable).
Tidy up code (a bit) and make it -Wall

Is this a 2.2 candidate ? (although it doesn't -Wall in 2.2 because
of the lack of sys/sysproto.h

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