removed need of R igraph from chlorodb/subdb

Former-commit-id: 574aace9be5804d728a877110f5f475d61644f75
Former-commit-id: 2e7ea63447643830a62f18a364327d7b396ec140

detectors/cds/tools/chlorodb/subdb/lib/db.cc.awk

@@ -0,0 +1,31 @@
+#
+#
+
+function visit(u, i, _local_, v) {
+  if (Visited[u]) return
+  Visited[u] = i
+  for (v in Edge[u]) {
+    visit(v, i)
+  }
+}
+
+/^#/ { next }
+
+{
+  Node[$1]++
+  Node[$2]++
+  Edge[$1][$2]++
+  Edge[$2][$1]++
+}
+
+END {
+
+  for (u in Node) {
+    if (Visited[u]) continue
+    visit(u, ++NbComp)
+  }
+
+  for (u in Node)
+    print u, Visited[u]
+  
+}