A number of major changes, involving moving a bit of stuff back from
editing.lisp (and CLIMACS EDITING) to base.lisp (and CLIMACS-BASE). * Reintroduced primitive, non-syntax-aware `previous-line' and `next-line' generic functions. * Moved `open-line' back to base.lisp and added a primitive `delete-line' function for deleting lines at a given mark. * Moved most of the character casing, tabyfying and indentation code back from editing.lisp to base.lisp. I'm still not sure it belongs there, but it will have to do for now.