ETS3/teach has an error when the robot has a prismatic joint

[amiao1017]

Describe the bug
ETS3/teach has an error when the robot has a prismatic joint

To Reproduce

W1 = 0.109;
W2 = 0.082;
L1 = 0.425;
L2 = 0.392;
H1 = 0.089;
H2 = 0.095;

e = ETS3.Rz("q1")*ETS3.Tz(H1)*ETS3.Ty(W1)*ETS3.Ry("q2")ETS3.Tx(L1)...
ETS3.Ry("q3")*ETS3.Tx(L2)*ETS3.Ry("q4")*ETS3.Ry(pi)*ETS3.Tz("q5")*ETS3.Ty(W2)*ETS3.Tz(H2)*ETS3.Rx(-pi/2)

e.fkine([0 -pi/2 0 0 pi/2])
e.teach

Screenshots

when you use ETS3.Rz("q5") instead of ETS3.Tz("q5"), everything is ok.

[petercorke]

The first-order cause is that we have to specify the range of the joint variable for a prismatic joint. For a revolute the default is -pi to pi, but for a prismatic joint there is no obvious default value. Specify ETS3.Tz("q5", qlim=[0,1]) or whatever the working range is. However, after that, there are further bugs which I'll need a bit of time to get my head back into this code.