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Enable comparisons between enums and their underlying types

Mark pybind11 include dir as PRIVATE to avoid a CMake error message.

Improve CI test coverage: eigen, numpy and C++14

Changes accessor::operator=() to throw error_already_set() instead of using pybind11_fail().

Mark the pybind11 headers as private to the target.

Fixes #305

PyObject_SetItem and PyObject_SetAttr both throws an exception on
failure so this will show the underlying exception instead of masking
it.

Fixes #303.

Rename examples files, as per #288

This renames example files from `exampleN` to `example-description`.

Specifically, the following renaming is applied:

example1 -> example-methods-and-attributes
example2 -> example-python-types
example3 -> example-operator-overloading
example4 -> example-constants-and-functions
example5 -> example-callbacks (*)
example6 -> example-sequence-and-iterators
example7 -> example-buffers
example8 -> example-custom-ref-counting
example9 -> example-modules
example10 -> example-numpy-vectorize
example11 -> example-arg-keywords-and-defaults
example12 -> example-virtual-functions
example13 -> example-keep-alive
example14 -> example-opaque-types
example15 -> example-pickling
example16 -> example-inheritance
example17 -> example-stl-binders
example18 -> example-eval
example19 -> example-custom-exceptions

* the inheritance parts of example5 are moved into example-inheritance
(previously example16), and the remainder is left as example-callbacks.

This commit also renames the internal variables ("Example1",
"Example2", "Example4", etc.) into non-numeric names ("ExampleMandA",
"ExamplePythonTypes", "ExampleWithEnum", etc.) to correspond to the
file renaming.

The order of tests is preserved, but this can easily be changed if
there is some more natural ordering by updating the list in
examples/CMakeLists.txt.

Fix #283: don't print first arg of constructor

This changes the exception error message of a bad-arguments error to
suppress the constructor argument when the failure is a constructor.

This changes both the "Invoked with: " output to omit the object
instances, and rewrites the constructor signature to make it look
like a constructor (changing the first argument to the object name, and
removing the ' -> NoneType' return type.

Add missing scipy run-time dep to eigen test

scipy is imported in pybind11/eigen.h when it encounters a sparse
matrix, which gets tested in the eigen test.

Add support for user defined exception translators

Skip eigen test when eigen header available but NumPy not

This allows (and changes the current examples) to exit with status 99 to
skip a test instead of outputting a special string ("NumPy missing").

This also fixes the eigen test, which currently fails when eigen
headers are available but NumPy is not, to skip instead of failing when
NumPy isn't available.