Improve lines in icon and diagram of Add blocks

Author: beutlich

Modelica/Blocks/Math.mo

@@ -938,7 +938,7 @@ Example:
           preserveAspectRatio=true,
           extent={{-100,-100},{100,100}}), graphics={
           Line(points={{-100,60},{-74,24},{-44,24}}, color={0,0,127}),
-          Line(points={{-100,-60},{-74,-28},{-42,-28}}, color={0,0,127}),
+          Line(points={{-100,-60},{-74,-24},{-44,-24}}, color={0,0,127}),
           Ellipse(lineColor={0,0,127}, extent={{-50,-50},{50,50}}),
           Line(points={{50,0},{100,0}}, color={0,0,127}),
           Text(extent={{-40,40},{40,-40}}, textString="+"),
@@ -951,7 +951,7 @@ Example:
               fillColor={255,255,255},
               fillPattern=FillPattern.Solid),Line(points={{50,0},{100,0}},
             color={0,0,255}),Line(points={{-100,60},{-74,24},{-44,24}}, color={
-            0,0,127}),Line(points={{-100,-60},{-74,-28},{-42,-28}}, color={0,0,127}),
+            0,0,127}),Line(points={{-100,-60},{-74,-24},{-44,-24}}, color={0,0,127}),
             Ellipse(extent={{-50,50},{50,-50}}, lineColor={0,0,127}),Line(
             points={{50,0},{100,0}}, color={0,0,127}),Text(
               extent={{-40,40},{40,-40}},

Modelica/ComplexBlocks.mo

@@ -652,7 +652,7 @@ result in the following equation:
                   fillColor={255,255,255},
                   fillPattern=FillPattern.Solid),Line(points={{50,0},{100,0}},
               color={0,0,255}),Line(points={{-100,60},{-74,24},{-44,24}}, color=
-               {0,0,127}),Line(points={{-100,-60},{-74,-28},{-42,-28}}, color={
+               {0,0,127}),Line(points={{-100,-60},{-74,-24},{-44,-24}}, color={
               0,0,127}),Ellipse(extent={{-50,50},{50,-50}}, lineColor={0,0,127}),
               Line(points={{50,0},{100,0}}, color={0,0,127}),Text(
                   extent={{-40,40},{40,-40}},
@@ -680,7 +680,7 @@ result in the following equation:
                   fillColor={255,255,255},
                   fillPattern=FillPattern.Solid),Line(points={{50,0},{100,0}},
               color={0,0,255}),Line(points={{-100,60},{-74,24},{-44,24}}, color=
-               {0,0,127}),Line(points={{-100,-60},{-74,-28},{-42,-28}}, color={
+               {0,0,127}),Line(points={{-100,-60},{-74,-24},{-44,-24}}, color={
               0,0,127}),Ellipse(extent={{-50,50},{50,-50}}, lineColor={0,0,127}),
               Line(points={{50,0},{100,0}}, color={0,0,127}),Text(
                   extent={{-40,40},{40,-40}},