small bug fix: prealloc memory for internal input/output stuff based on internal input/output operation count.
style cleanup.
do not wait for return status frames when the node is configured for not sending them.
remove useless debug information.
new option to set status return level to 1 in order to limit traffic jam on dynamixel bus.
In order to fix incorrect bloc execution order, the darwinop_communication and usb2dynamixel_communication blocs must set the direct feedthrough from their inputs to their outputs. This ensures that inputs are stabilized (computed) before the block is executed, removing the all startup glitches. this direct feedthrough flags require that delays are inserted in closed loop designs.