Change notebook to have a third horizontal tab

Inertial machines has to be always using the axis:
1. if it's rotatory (friction): in contact with axis
2. if it's rotatory (axis): connected to axis
3. if it's linear (string): rolled at the axis

in all need to provide the inertia momentum, body weight and extra weight (if any)

in the 2. and 3. need to provide the diameter of the axis 

In all the cases, need to convert data using fixRawdataInertial
because we need to know the change of direction

also preselect con-ecc when inertial machine is selected. Put in the same tab

Need also to save encoder type and load encoder type. This has to be useful to have data introduced always and have different encoders.


Finally need to add the code and explanation for the calculation of the inertia momentum:

    ----------
   /          \
  /         W  \
 /         /    \
|         /      |
|        o       |
|                |
 \              /
  \            /  
   \          /
     --------

Weight has not to be on the top of the axis (has to be "sided")
Measure weight
Measure distance between centre of axis and centre of weight