switched back to tuple as parameter for parallelized functions (necessary for "imap" function in multiprocessing)
fixed small issues of the "cutter.moveto/cutter.drop" transition


git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@750 bbaffbd6-741e-11dd-a85d-61de82d9cad9