Since here they appear after `wcs : type`, I thought the `WCS` endings were superfluous.  Also, I decided that it made sense to join the local type with their corresponding non-local type, which in config is differentiated by whether there is an `origin` or `world_origin` parameter to offset either origin from 0.  So `wcs : type : Shear` uses either `ShearWCS` or `OffsetShearWCS` as required based on the other parameters.