The internals of the port have been substantially reworked:
* All predefined instances can be selected via options [1]
* Optionally use options, if user does not overwrite instance list
* Make translation with pypy an option, if it is available.
* Make memory checking more refined [2]
* Add a Wiki page details lang/pypy
* Fix the test target
* Refactor build target (easier to review, edit)
* Rename patches to prevent churn
[1] Although two are broken upstream and one possibly discontinued
[2] My memory limits appear to be too conservative. Set PYPY_IGNORE_MEM for now
Reviewed by: Kuro <poyopoyo@puripuri.plala.or.jp>, rm@
Approved by: bdrewery (mentor)