Bring in a 90% rewrite of the pcm.4 manual page.  This adds tunables, loader options, information on VCHANs, and more.
Bring in a 90% rewrite of the pcm.4 manual page.  This adds tunables, loader
options, information on VCHANs, and more.

Based on content submitted by:	Mathew Kanner <mat@cnd.mcgill.ca> && Cameron Grant
Update requested by:		ru, and I think hmp

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