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* Enable py::ellipsis on Python 2

* Enable py::ellipsis tests on Python 2 and mention `Ellipsis` in the docs

Added a check on CMake 3.12+ to make sure the file listing is up to date. And caught a missing file with it!

Fixes issue #1878

* add uninstall target for cmake

* only add target when built as master project
Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>
Co-authored-by: Henry Schreiner <HenrySchreinerIII@gmail.com>

fix: include PYTHON_IS_DEBUG

fixes #2191

If the default argument value is a class, and not an instance of a
class, `a.value.attr("__repr__")` raises a `ValueError`. Switching to
`repr(a.value)` makes this use case work.

Fixes #2028