cleanup of makefile updating to make it work again and simplified the logic that actually alters the makefile, to use simple regular expressions instead of infofile parsing, to keep the structure of the makefile intact
Rework make_download_kraftwagen_directory to be compatible with the 5.x version and the 6.x version of Drush.
symlink is destroyed after moving from tmp folder by drush.
fix logic and ln command.
fix code style. Switch functions to drush API.