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2097eab028
Before: - if `wheel` was not already installed, then `get-pip.py` would automatically install the latest version on PyPI, which is `0.34.2` (or `0.33.6` for Python 3.4). - if `wheel` was already installed, then it was left unchanged regardless of the version installed. Now: - if `wheel` is not already installed, then the same versions will be installed as before, except these versions are pinned and will now not change unexpectedly after future `wheel` releases. - if `wheel` is already installed, then it's upgraded/downgraded to the target version as needed. Partly addresses #1000, though this change only helps builds where the pip/setuptools/wheel install flow is triggered (currently only new apps or ones where Python was purged or pip was not the correct version). Since the wheel version is now known, it's output to the build log to ease debugging and for parity with pip/setuptools. The rest of #1000 will be fixed in later commits.