Paul Bauer authored Apr 26, 2018 and Mark Abraham committed Apr 26, 2018

The files needed to build the reference manual have been moved around
such as that each chapter has its own subdirectory.

At the same time, the image files have been moved to the respective
directories as well.

CMake has been adpated to use the new directory structure.

Change-Id: I819c2168a635d23b659258f360fe1c423d2689c3