[IMP-dev] Simplified SConscripts in core, misc

I've been using a simplified set of SConscripts for the search module which simply uses all .h's in include/ and include/*/ and all .cpps in src and src/*/ rather than just a specified list. The removes the need to run the make-sconscript script when you add headers. Unless anyone objects I'll change the core scripts to do this. And then there will be one less thing to keep in sync :-)