wrong check for boost libraries in configure.ac

[Stephen M. Webb]

The configure.ac file checks for the presence of various Boost libraries by checking the presence of certain header files. Unfortunately, Boost packaging has changed so that headers come from a different package than development library binaries do, so you get a failure in 'make check' when the boost packages are noit installed, even though the configure thinks they are installed.

For example, Nux's configure.ac checks for the presence of boost/filesystem/fstream.hpp to see if boost_filesystem.so is present, but the header comes from libboost1.XX-dev and the library from the libboost-filesystem1.XX-dev package.