On Win Boost is not automatically compiled anymore.

An unreproducable Visual Studio error occurred several times for several users
("B A T C H   R E C U R S I O N  exceeds STACK limits") so Boost installation as
described here http://docs.opengeosys.org/docs/devguide/getting-started/prerequisites
is now mandatory on Windows.

Additionally Boost can now installed into the CMAKE_LIBRARY_SEARCH_PATH, e.g.
C:\libs\boost