* tool-id (e.g. "T1")
 * allow to use general IO streams instead of a file output
 * allow to skip the "M2" command ("end program") for multiple assembled toolpaths


git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@175 bbaffbd6-741e-11dd-a85d-61de82d9cad9