Make pairs(df.type) return class methods

docs/changelog.txt

@@ -42,6 +42,9 @@ changelog.txt uses a syntax similar to RST, with a few special sequences:
 ## Fixes
 - `tweak` embark-profile-name: fixed handling of the native shift+space key
 
+## Lua
+- ``pairs()`` now returns available class methods for DF types
+
 # 0.47.04-beta1
 
 ## Fixes

library/LuaWrapper.cpp

@@ -1608,8 +1608,8 @@ static void RenderType(lua_State *state, compound_identity *node)
     lua_dup(state);
     lua_setfield(state, ix_meta, "__index");
 
-    // pairs table
-    lua_newtable(state);
+    // pairs table - reuse index table
+    lua_dup(state);
     int ptable = base+4;
 
     lua_pushvalue(state, ptable);