The axis
constraint imposes an orientation limitation where bodies
are restricted to rotate only around a fixed axis.
The set of commits optionally introduces the inclusion of maximum and
minimum rotation angle constraints to the axis
constraint.
The following plot shows the rotation angle of the body modelled in "test-case.zip" with respect to the reference orientation. The inflow changes at t=2[s] and =4.5[s] to move the body in the opposite directions: