Automatic sanity checks to add

[traversaro]

• Easy: Verify that all the joint are either of type fixed or revolute (to avoid regression such as [iCubGazeboV3] Stange behaviour of the left leg with the fixed model icub-models#72)
• Hard: Verify that the models meant to run in Gazebo can be spawned and not explode

[traversaro]

• Easy: Check simmechancis file for failures of the type "Could not solve for constraint between SIM_ICUB3_R_ANKLE_2 and SIM_ICUB3_R_FOOT_REAR because of CAD constraint"

[traversaro]

• Easy: Verify that all the joint are either of type fixed or revolute (to avoid regression such as robotology/icub-models#72)

Related issue: robotology/icub-models#93 .

[traversaro]

Another useful sanity check would be to check that the total weight of the model (that you can get from iDynTree::Model::getTotalMass() ) and check that its difference w.r.t. to the measured one is below a threshold. This would avoid regression such as robotology/icub-models#94 . fyi @maggia80 @DanielePucci