Oops, forgot to clear out the equations (and the entities, though I

don't use them) in the System.

[git-p4: depot-paths = "//depot/solvespace/": change = 1949]

exposed/lib.cpp

@@ -238,6 +238,9 @@ default: dbp("bad constraint type %d", sc->type); return;
 
     bad.Clear();
     SYS.param.Clear();
+    SYS.entity.Clear();
+    SYS.eq.Clear();
+
     SK.param.Clear();
     SK.entity.Clear();
     SK.constraint.Clear();