- bsp-cli: `postinst` is now generated _after_ the hooks are run
- hooks are allowed to append to `postinst_functions` array
- hooks are _not_ allowed to modify `DEBIAN/postinst` directly anymore (it won't even be there)
- rewrite the postinst stuff in `helios4`'s `family_tweaks_bsp()` to use new way
- introduce `add_file_from_stdin_to_bsp_destination()`, a helper for easy heredoc-based adding of files to bsp-cli
- First and only argument is the destination path, relative to the root of the package -- do NOT include $destination -- it is already included.
- Containing directory, if any, is created automatically (no more "mkdir -p x; cp y x/z")
- The full path (including $destination) is set in $file_added_to_bsp_destination, declare in outer scope to get it if needed.
ee565514c9