minor syntax adjustments

add_mesh_3d_function_surface.py

add_mesh_gears.py

add_mesh_solid.py

io_export_directx_x.py

io_export_unreal_psk_psa.py

io_import_scene_mhx.py

io_mesh_raw/import_raw.py

io_mesh_stl/stl_utils.py

object_fracture/fracture_ops.py

render_povray/render.py

space_view3d_spacebar_menu.py