patch from Cessen

Adds a new set of bones to rig types which are to be used for weight paint vgroups, in some these have some more segments to account for twist. also use Aligoriths new copy transform constraint.

release/scripts/modules/rigify/palm_curl.py

@@ -98,6 +98,30 @@ def metarig_definition(obj, orig_bone_name):
     return [palm_parent.name] + bone_definition
 
 
+def deform(obj, definitions, base_names, options):
+    for org_bone_name in definitions[1:]:
+        bpy.ops.object.mode_set(mode='EDIT')
+
+        # Create deform bone.
+        bone = copy_bone_simple(obj.data, org_bone_name, "DEF-%s" % base_names[org_bone_name], parent=True)
+        
+        # Store name before leaving edit mode
+        bone_name = bone.name
+        
+        # Leave edit mode
+        bpy.ops.object.mode_set(mode='OBJECT')
+        
+        # Get the pose bone
+        bone = obj.pose.bones[bone_name]
+        
+        # Constrain to the original bone
+        # XXX. Todo, is this needed if the bone is connected to its parent?
+        con = bone.constraints.new('COPY_TRANSFORMS')
+        con.name = "copy_loc"
+        con.target = obj
+        con.subtarget = org_bone_name
+
+
 def main(obj, bone_definition, base_names, options):
     arm = obj.data
 
@@ -117,6 +141,8 @@ def main(obj, bone_definition, base_names, options):
     offset = (pinky_ebone.head - ring_ebone.head)
 
     control_ebone.translate(offset)
+    
+    deform(obj, bone_definition, base_names, options)
 
     bpy.ops.object.mode_set(mode='OBJECT')