Remove extra/floating_point_utilities_v3

This library is shipped in Boost since 1.47.0,
no need to ship an embedded version any more.
Remove some 'using namespace boost'

All of them should bve removed from the source
Remove some more `using namespace boost`.
Remove all remaining `using namespace boost`
Fix compilation in DEBIG-mode.
Link against libboost_date. Fix LP:1322274