Add test for euler
WOrk on test for HT (But failing -> need to check math in literature again)
Change gitlab CI/CD hopefully doc will compile

was redundant with build.sh

it was useless because it can be generated

The markers on the animal may not always be perfectly position relative to the anatomy
A correction matrix (4x4) can now be used to do that

For loops on viewing directions have been removed.
It leads to 200x faster computation :)