IK Solver:

* Rename Legacy to Standard, it's not being deprecated as far as I know.
* Make option to toggle off Location solving work with Standard.
* Make it converge a bit better in some cases by enforcing a minimum number of
  iterations before giving up.
* Move IK solver choice out of bone panel, it's an armature level setting and
  should be set there.

release/scripts/startup/bl_ui/properties_object_constraint.py

@@ -134,7 +134,7 @@ class ConstraintButtonsPanel():
             layout.prop(con, "ik_type")
             getattr(self, 'IK_' + con.ik_type)(context, layout, con)
         else:
-            # Legacy IK constraint
+            # Standard IK constraint
             self.target_template(layout, con)
             layout.prop(con, "pole_target")
 
@@ -151,17 +151,27 @@ class ConstraintButtonsPanel():
             col.prop(con, "iterations")
             col.prop(con, "chain_count")
 
-            col.label(text="Weight:")
-            col.prop(con, "weight", text="Position", slider=True)
-            sub = col.column()
-            sub.active = con.use_rotation
-            sub.prop(con, "orient_weight", text="Rotation", slider=True)
-
             col = split.column()
             col.prop(con, "use_tail")
             col.prop(con, "use_stretch")
-            col.separator()
-            col.prop(con, "use_rotation")
+
+            layout.label(text="Weight:")
+
+            split = layout.split()
+            col = split.column()
+            row = col.row(align=True)
+            row.prop(con, "use_location", text="")
+            sub = row.row()
+            sub.active = con.use_location
+            sub.prop(con, "weight", text="Position", slider=True)
+
+            col = split.column()
+            row = col.row(align=True)
+            row.prop(con, "use_rotation", text="")
+            sub = row.row()
+            sub.active = con.use_rotation
+            sub.prop(con, "orient_weight", text="Rotation", slider=True)
+
 
     def IK_COPY_POSE(self, context, layout, con):
         self.target_template(layout, con)