Custom tmpfs through label

Closes #106

See merge request !133

In order to allow container with special needs like
ROS requiring some read/write space, the Container
class now parses the new custom "beat.env.custom_tmpfs"
label and add the corresponding entries to the dictionnary
dedicated to them.

Fixes #106

Refactor database sharing

Closes #105

See merge request !132

The prefix is resynced after the CXX tests, therefore
ensure that the original root_folder setup is applied
again.

This avoids breaking tests when CXX tests run before
the raw access tests.

This field will allow database creator to specify
whether the raw data can be made directly accessible
to the algorithm execution container.

Fix algorithm name pattern in experiment globals

Closes #104

See merge request !131

It's missing support for - in the author part of
algorithm author name.

Fixes #104

Add missing global parameters to shared_datasets experiment

See merge request !130

Sphinx 3 autodoc no longer accepts autodoc_default_flags and autodoc_default_options should be used

See merge request !129

Algorithm database sharing

Closes #103

See merge request !128

beat/beat.cmdline re-implements similar parts so
make them reusable

This will grab the version currently used for the test
and in this case with the root_folder entry fixed for
the tests.

This will allow to use them in the same temporary
folder used for other test data.

It's not handled in the setup/teardown of the test package.

This will avoid the docker daemon to create them
and make them belong to it and thus not properly
accessible if the daemon is root.

This will allow the docker tests to more easily setup and
cleanup its content.

While the folder is not used as these databases are generative
only, docker will create it anyway as mounting a non-exisiting
folder will trigger its creation with the daemon ownership
applied.

A new property in the execution configuration allows to
mount the various databases in the algorithm container
in a similar fashion as the database container. It will
only work for containers that needs to access datasets.

Fixes #103