generate doclist automatically based on modelist

demo/kitchen-sink/docs/d.d

@@ -0,0 +1,14 @@
+#!/usr/bin/env rdmd
+// Computes average line length for standard input.
+import std.stdio;
+
+void main() {
+    ulong lines = 0;
+    double sumLength = 0;
+    foreach (line; stdin.byLine()) {
+        ++lines;
+        sumLength += line.length;
+    }
+    writeln("Average line length: ",
+        lines ? sumLength / lines : 0);
+}