Add orientation parameter to ymport.textClumps
Resize ForceContainer after each body insert

In a very rare cases, when clumps (possibly other
bodies also) are generating continuosly without
immediate contact to another body, ForceContainer
can be not large enough to store force/torque information.

Here we push zero force and torque to ForceContainer
after each body insert to resize it if neccessary.

Thanks Jörg Medack for bug report.
Added assert to get*Unsynced function

Do not return _zero if there is a try to
access out of size element.