move script directories for internal blender scripts.

ui/ --> startup/bl_ui
op/ --> startup/bl_operators

scripts/startup/ is now the only auto-loading script dir which gives some speedup for blender loading too.

~/.blender/2.56/scripts/startup works for auto-loading scripts too.

release/scripts/startup/bl_ui/properties_data_empty.py

@@ -0,0 +1,42 @@
+# ##### BEGIN GPL LICENSE BLOCK #####
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program; if not, write to the Free Software Foundation,
+#  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+#
+# ##### END GPL LICENSE BLOCK #####
+
+# <pep8 compliant>
+import bpy
+
+
+class DataButtonsPanel():
+    bl_space_type = 'PROPERTIES'
+    bl_region_type = 'WINDOW'
+    bl_context = "data"
+
+    @classmethod
+    def poll(cls, context):
+        return (context.object and context.object.type == 'EMPTY')
+
+
+class DATA_PT_empty(DataButtonsPanel, bpy.types.Panel):
+    bl_label = "Empty"
+
+    def draw(self, context):
+        layout = self.layout
+
+        ob = context.object
+
+        layout.prop(ob, "empty_draw_type", text="Display")
+        layout.prop(ob, "empty_draw_size", text="Size")