* Revised Raspbian toolchain
* Added FORCE_LINK argument to remake_add_library(), allowing to
  link with the --no-as-needed linker flag set
* Fixed remake_debug() to correctly display environment variables
* Extended remake_find_package() to obey toolchain file settings
  for the pkg-config system root and search directories
* Changed remake_ros() behavior for non-existing directories in the
  ROS_PACKAGE_PATH (now generating a warning instead of a fatal error)
* Added FORCE_CONSISTENCY option to remake_distribute_deb()