allow elevations to show negative values

removed RL - not standard throughout the world

src/blenderbim/blenderbim/bim/module/drawing/svgwriter.py

@@ -783,7 +783,7 @@ class SvgWriter:
             text_position = Vector(
                 (
                     (x_offset + projected_points[0].x) * self.svg_scale,
-                    ((y_offset - projected_points[0].y) * self.svg_scale) - 2.5,
+                    ((y_offset - projected_points[0].y) * self.svg_scale) - 1.0,
                 )
             )
             # TODO: allow metric to be configurable
@@ -801,7 +801,7 @@ class SvgWriter:
             text_style = SvgWriter.get_box_alignment_parameters(box_alignment)
             self.svg.add(
                 self.svg.text(
-                    "RL +{}".format(rl),
+                    "{}".format(rl),
                     insert=tuple(text_position),
                     class_="PLANLEVEL",
                     **text_style,