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Remove dependency to OpenGL

Make libGL linking private

fix for 5.0 < Qt < 5.9

QTemporaryDir::errorString was introduced in Qt 5.6
QTemporaryDir::filePath was introduced in Qt 5.9

Ubuntu 16.04 has Qt 5.5, and Debian Stretch has 5.7

Fix linking bug

On Arch, libPythonQt.so is not linked to libpython.so

Update readme and package.xml.

Improve some properties.

[CMake] fix component requirement

as this is where the libpythonqt-qt5-common-dev package on 18.04 put its
includes.

For Archlinux, where pythonqt lib only has the python major version
number.

In #143, the QtAll component of PythonQt is required, meaning that if we
find PythonQt but not its QtAll component, we should consider that
PythonQt was not found.

I thought that `FIND_PACKAGE(PythonQt COMPONENTS QtAll REQUIRED)` as
opposed to `FIND_PACKAGE(PythonQt REQUIRED COMPONENTS QtAll REQUIRED)`
would mean that, but actually, this second `REQUIRED` implies a failure
of the configure step if PythonQt is not found.

Homogenize API of WindowsManager

Add possibility to write logs into file.

Compatibility with PythonQt 3.2