* bin/cross-compile-stage.sh, bin/prepare-clfs.sh
  Corrected paths to library scripts; changed from "lib" to "../lib".
* packages/pkg-template.sh
  (cross_compile_*, temp_system_*, final_system_*)
  Added some default instructions; most of the packages will be able
  to use these without modification, or at least with very little.
* lib/functions.sh
  (cleanup_package) Fix: remove build tree, if exists; typo would try to
  remove PKG_SOURCE_DIR again instead of PKG_BUILD_DIR.
  (dump_package) Fix: create build tree, if different from source tree.