Work on LCIO-31 and LCIO-32.  Add ant target for cleaning up generated source files.  Implement missing C++ header generation using Maven.  (CMakeLists.txt is not touched yet.)
Work on LCIO-31 and LCIO-32.  Add ant target for cleaning up generated source files.  Implement missing C++ header generation using Maven.  (CMakeLists.txt is not touched yet.)

petricm/LCIO,iLCSoft/LCIO,petricm/LCIO,petricm/LCIO,iLCSoft/LCIO,iLCSoft/LCIO,iLCSoft/LCIO,petricm/LCIO,petricm/LCIO,iLCSoft/LCIO,petricm/LCIO,iLCSoft/LCIO