additional features

Document the additional cpuset features:
	notify_on_release
	marker_pid
	memory_pressure
	memory_pressure_enabled

Rearrange and improve formatting of existing documentation for
cpu_exclusive and mem_exclusive features.

Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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