crane.get_length() does is adding new value to old values on each call

[castn]

Properply tower, jib and counterjib as well. Calling them two times results in having a number two times higher than on the first time.

[eZSnake]

Should be handled by resetting length when doing other resets

[eZSnake]

Should be handled by resetting length when doing other resets

So an easy fix

[eZSnake]

fixed in feb887a1f1c2d80c5a912fa03e2c347756ffda23