added removeedge! for Graph

src/base/graph.jl

@@ -150,6 +150,25 @@ end
 
 #################################################################################
 
+"""
+    function removeedge!(graph::Graph{T}, node1::T, node2::T) where T
+
+Removes the edge between `node1` and `node2`. If `node1` or `node2` are not present in
+the `Graph`, throws an error. If the edge does not exist, nothing is changed.
+"""
+function removeedge!(graph::Graph{T}, node1::T, node2::T)::Nothing where T    
+    if !hasnode(graph, node1) || !hasnode(graph, node2)
+        error("`removeedge!()`: `node1=$node1` and/or `node2=$node2` do not exist in the graph !!")
+    end
+
+    delete!(graph[node1], node2)
+    delete!(graph[node2], node1)
+
+    return nothing
+end
+
+#################################################################################
+
 """
     function isneighbor(graph::Graph{T}, node1::T, node2::T)::Bool where T
 

src/export.jl

@@ -32,6 +32,7 @@ export
     hasnode,
     addnode!,
     addedge!,
+    removeedge!,
     isneighbor,
     bfs,
     nodes_from_bfs,
@@ -172,6 +173,7 @@ export
     # ttn/helper_internal_funcs.jl
 
     # ttn/ttn_generators.jl
+    distribute_site_positions,
     default_graph_sitenodes,
     randomTTN,
     default_randomTTN,