Make the complex gradient proposal shown on the proposal page.

a9fc84a6 · Frederic · daae1ad4 · a9fc84a6
--- a/doc/proposals/index.txt
+++ b/doc/proposals/index.txt
@@ -12,4 +12,4 @@ Proposals for new/revised features
    noupdates
    opt_patterns2
    graphical_models
+    complex_gradient