+ default is boost::optional<T>
+ add test for boost::optional

* add test_std_vector.py
* fix copyable.hpp's include guards & namespace
* same for pickle-vector
* expose std::vector for VectorXd, MatrixXd, VectorXi, MatrixXi

* cmake: use REQUIRED

* core: fix issue with Python 3.10 and more

* core: fix logic

* core: fix

* core: further fix

* Core: use official solution

Co-authored-by: Guilhem Saurel <guilhem.saurel@laas.fr>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci



* core: fix

Co-authored-by: Guilhem Saurel <guilhem.saurel@laas.fr>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

fix build on NetBSD 9.2

Setting INSTALL_DOCUMENTATION OFF wasn't respected as it was overridden
in post-project.cmake which gets called upon setting PROJECT(). Moving
the settings prior to the include of base.cmake, it works as intended.

This reverts commit 3ae34565.

Boost 1.73 added a boring warning about deprecated use of boost bind,
which is still used by boost python.

As of Boost 1.75, this is still not fixed:
https://github.com/boostorg/python/pull/296
https://github.com/boostorg/python/pull/315

Recent CMake versions added this warning:
CMake Deprecation Warning at CMakeLists.txt:6 (CMAKE_MINIMUM_REQUIRED):
  Compatibility with CMake < 2.8.12 will be removed from a future version of
  CMake.

And we are not compatible with CMake < 3.1:
ref https://github.com/jrl-umi3218/jrl-cmakemodules/issues/338