fix whitespace and license regressions in Slime

@arthurhjorth, note that the models in version control must not
include any license or copyright information.  that information is
added automatically by the "notarize" script at release time.

we do it that way because hand-maintaining the license information
would be an impossibly vast and tedious task.  (we know, because we
used to do it that way, causing much pointless work, much grief, and
countless mistakes, omissions, and inconsistencies in the results)