Changed the nsURIs of Slam packages from net.sf.dftools to org.ietr.dftools.
Modified the .genmodel with new package names (org.ietr.dftools) and re-generated model code.
Replaced all occurrences of net.sf.dftools by org.ietr.dftools in Strings and non-Java files (files left unmodified by the source refactoring).
Replaced all occurrences of net.sf.graphiti by org.ietr.dftools.graphiti in Strings and non-Java files.