* Made GridInjector a child of flow view. See #227
* Replaced 4 variables with dynamically computed values. See #226
* Replaced multiple pipe segment nodes with a single node scaled in x-direction. See #225
* Eliminated intermediate nodes with a single child. See #224
* Extracted PipeNodeDragHandle from PipeNode. WIP. See #223
* Added back the additional node for pipeFluid. See #183