Fix important bug in 1.6.10

It is not possible to convert from MatTypeBase to MatType. I put some codes that might be changed.

Improve conversion

Improve packaging and export of the project

Fix Python documentation

[CI] use memmos instead of eur0c

which is an obsolete PAL distribution

One hard disk drive is dead in our "eur0c" server. The RAID array needs
it to be replaced. eur0c is 2 months out of warranty. We already had this
budgetized, but Marchés Publics says we can only buy from one supplier,
and this supplier has 21 days delivery delays for this HDD.

Let's use another server instead.

python: fix exposion of the version

python: fix import

python: install lib inside site-packages/eigenpy

Towards a full CMake export of the project