* Several bug fixes in ReMakeROS:
  + macro cleanups
  + remake_ros_package_generate() now adds additional target dependencies,
    make with multiple processes does not fail anymore
  + remake_package_add_library/executable() sets target link flags
    from libs-only-other reported by rospack (untested)
  + remake_ros_pack_deb() does not create unnecessary packages,
    therefore checks the newly implemented component variable EMPTY