The AUTHOR block was formatted using fixed with font and no line
break by mistake. Change this to normal text formatting.
The problem was discovered by Debian thanks to lintian, and is fixed
there in using a local change in debian/patches/man-page-adjustment.patch.
Cleans up the root directory of the GitHub source tree and starts to separate platform-specific installing and packaging logic from the master CMakeLists.txt. Closes#2201