remove unnecessary macros BiRel_Back and BiRel_Back_Neighbor

C4.puml

@@ -850,10 +850,6 @@ $getRel("<<-->>", $from, $to, $label, $techn, $descr, $sprite, $tags, $link)
 $getRel("<<--", $from, $to, $label, $techn, $descr, $sprite, $tags, $link)
 !endprocedure
 
-!unquoted procedure BiRel_Back($from, $to, $label, $techn="", $descr="", $sprite="", $tags="", $link="")
-$getRel("<<-->>", $from, $to, $label, $techn, $descr, $sprite, $tags, $link)
-!endprocedure
-
 !unquoted procedure Rel_Neighbor($from, $to, $label, $techn="", $descr="", $sprite="", $tags="", $link="")
 $getRel("->>", $from, $to, $label, $techn, $descr, $sprite, $tags, $link)
 !endprocedure
@@ -866,10 +862,6 @@ $getRel("<<->>", $from, $to, $label, $techn, $descr, $sprite, $tags, $link)
 $getRel("<<-", $from, $to, $label, $techn, $descr, $sprite, $tags, $link)
 !endprocedure
 
-!unquoted procedure BiRel_Back_Neighbor($from, $to, $label, $techn="", $descr="", $sprite="", $tags="", $link="")
-$getRel("<<->>", $from, $to, $label, $techn, $descr, $sprite, $tags, $link)
-!endprocedure
-
 !unquoted procedure Rel_D($from, $to, $label, $techn="", $descr="", $sprite="", $tags="", $link="")
 $getRel("-DOWN->>", $from, $to, $label, $techn, $descr, $sprite, $tags, $link)
 !endprocedure

percy/TestRelations.puml

@@ -29,12 +29,8 @@ Rel_Back_Neighbor(RelFrom, "To_Rel_Back_Neighbor_Tech", "A label", "A techn")
 
 BiRel(BiRelFrom, "To_BiRel", "A label")
 BiRel(BiRelFrom, "To_BiRel_Tech", "A label", "A techn")
-BiRel_Back(RelFrom, "To_Rel_Back", "A label")
-BiRel_Back(RelFrom, "To_Rel_Back_Tech", "A label", "A techn")
-BiRel_Neighbor(RelFrom, "To_Rel_Neighbor", "A label")
-BiRel_Neighbor(RelFrom, "To_Rel_Neighbor_Tech", "A label", "A techn")
-BiRel_Back_Neighbor(RelFrom, "To_Rel_Back_Neighbor", "A label")
-BiRel_Back_Neighbor(RelFrom, "To_Rel_Back_Neighbor_Tech", "A label", "A techn")
+BiRel_Neighbor(BiRelFrom, "To_BiRel_Neighbor", "A label")
+BiRel_Neighbor(BiRelFrom, "To_BiRel_Neighbor_Tech", "A label", "A techn")
 
 Rel_D(RelShort, "To_Rel_D", "A label")
 Rel_D(RelShort, "To_Rel_D_Tech", "A label", "A techn")