Vetala Beta 0.5.2.1

[louisVottero]

• updates
  
  Fixes
• Maya file saves in the Vetala data now version up properly.
• Some compatibility with old Vetala processes fixed.
• Fix to TransferWeights when there are zero weights
• Fix to TransferWeights when vert order isn't the same
• attr.connect_visibility fixed when a None value is in the list of target nodes passed in.
• fix to TwistRig setup when there is no top and btm main control. Also a fix for when twist joint has siblings.
• fix to stretchy ribbon.
• fix for progress bar esc
• triangle curve for controls now more centered.
• fix for twist attribute getting applied twist on ik leg
  
  Improvements
• rigs_util.create_compression_joint now has a pointConstraint option, default is parentConstraint
• space.BoundingBox now has an ignore invisible option. This will ignore hidden geometry when calculating the bounding box.
• space.orient_z_to_child added
• orient_x_to_child_up_to_surface neg_aim option added
• orient_x_to_child neg_aim option added
• orient_y_to_child neg_aim and up_axis options added and some fixes
• viewport gets paused when Vetala is running. This makes building significantly faster in some cases. Use core.refresh instead of cmds.refresh when needed to update during code run.
• process.set_sub_folder will now set to default when no sub folder given
• attr.StoreData now has an attribute name option. Default is "DATA"
• process.get_data_override added, to easily get the current data override
• blendshape.transfer_blendshape_targets now has a uv space option
• deform.CopyDeformation now has a work in uv space option
• rig.FaceSliders now compensates for different joint scales