Arm drops on publishing zero velocities (arm_joint_2 etc.)

[hackan88]

When publishing zero velocities to certain arm joints, the arm collapses. This is true for arm_joint_2, and some later joints (not arm_joint_1).
I suspect this can be resolved by adding "static_cast(msg.velocities[i].value));" to JointControlPluglet.cpp, line 126: "simSetJointTargetVelocity(handle, msg.velocities[i].value);"

However, as the current master-branch does not work for me, I can't do a pull request with my current version.

[mfueller]

I have added your suggestion and fixed some problem that causes crashes on my machine (Arch linux, ros jade).
I could not control the arm and base without any problems.