This changes makes a cmake build check for an existing
versions.h file in the source directory before it builds
anything else. If it finds it it will fail the build.
This is to prevent confusion when someone tries to use cmake
on a source directory where the old build system was used
before (as this is not supported).
- Moved some larger sections in CMakeLists.txt into separate files
- Fixed an include issue on OS X
- Fixed boost version
- Use PROJECT_VERSION by default instead of using versions.target
mpilman