Merge pull request #3 from amifsud/master

Add commandds for changing coefficients and measurement of the time of the flexibility computation
add point mode and acceleration order to moving frame transformation
Add an acceleration vector output signal
update plotscript
Correct the com state vector construction
Correct the transformation of the inertia Matrix
Rename the older flexibility estimator into model free
Complete the model based implementation of the estimator
Refactoring to more precision in the names
Update instanciation test
Add missing files