ref https://github.com/stack-of-tasks/pinocchio/issues/849

[CMake] add BUILD_PYTHON_INTERFACE option

delete shell

ref https://github.com/stack-of-tasks/sot-core/issues/58

[CI] Update .gitlab-ci.yml for v3

This reverts commit 292cbff2.

 [CI] add .gitlab-ci.yml 

This allows to do 'print solver' in the python interface.
The 'dispTask' method is kept for transition purpose.

Again, for homogeneization purposes.

Use the dedicated macro to this purpose.
The error came from the fact that the method was not declared
as const. The consequences were that the following python orders
were possible:

mytask = TaskInequality ('mytask')
mytask = Task ('mytask')

The second line should crash but doesn't, because the method getClassName
called is the one of the mother class.

They have been moved in sot-dynamic/sot-pattern-generator.

[skip ci]