2.2:
	- break p suffix off from alpha/beta/pre/rc suffixes
	  ... {a-z}, {alpha,beta,pre,rc}, {p}, {-r#} ...

3.4:
	- arch.list defines valid KEYWORDS, not ARCH
	- drop "EAPI-0" from dependency atoms notes
	- declare a new "pms_version" file ?

8.2:
	- allow KEYWORDS in eclass (useful for groups of ebuilds that are
	  live-cvs only and largely handled by an eclass)

9.2.1:
	- SLOT dependencies are EAPI-1

11.1.2: Phase-specific variables
	- do not document INSDESTTREE, it's an internal portage variable

11.3.3: Ebuild-specific Commands
	- econf
	  - do not say anything about --prefix and overriding from caller
	  - --build should be the value of CBUILD (if present)
	  - --target should be the value of CTARGET (if present)
	  - ABI stuff is a mess ... do we want to encode this into PMS ?
	    just say --libdir=/usr/$(get_libdir) ... ?
	  - no mention of EXTRA_ECONF
	- Installation commands
	  - should not mention any of the internal variables ... refer to them
	    relatively ... dobin installs into the prefix controlled by 'insinto'
	    which defaults to /usr
	  - dolib: see econf ABI discussion