[$] Layers and abstractions

In software, we tend to build abstraction layers. But, at times, thoselayers get in the way, so we squash them. In a talk at SCALE 17x inPasadena, CA, Kyle Anderson surveyed some of the layers that we havebuilt and squashed along the way. He also looked at some of the layersthat are being created today with an eye toward where, how, and why they mightget squashed moving forward.