Admin/polyml/CHECKLIST

updated to polyml-5.5.0-3 based on fixes-5.5 version 1658, which provides important improvements;

Notes on building Poly/ML as Isabelle component
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* copy README

* copy build

* copy etc/settings

* include full source (without symlink)

* include sha1 source and binary for each platform

* copy polyml script for each platform

* linux: include copy of libgmp.so with symlinks from build host