Process for upgrading the stdlib to a new cpython version
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(Based on the method used by PyPy.)

0. Update a CPython checkout to latest.
1. git checkout python-stdlib
2. ./src/core/IronPython.StdLib/upgrade-stdlib.sh ~/path/to/cpython
3. git checkout -b update-stdlib master
4. git merge --no-ff python-stdlib
5. Fix conflicts, etc.
6. commit
7. git checkout master
8. git merge update-stdlib && git branch -d update-stdlib

