* Perl/Tk: line_do_offset directive (documentation, implementation)
* routing_helper-orig: don't plot lines with an offset

  Uses the new line_do_offset directive.
* convert_radwege: emit line_do_offset directive in exact mode
* radwege_exact: first conversion with line_do_offset:1
* data update (minor)
* no arrows when plotting cyclepath data in edit mode
* data update (temp blockings additions)