added option that improves performance to get_vox_dist; added function for turning vertex data into voxel data (workaround for missing vertexdata in webshow)
added option that improves performance to get_vox_dist; added function for turning vertex data into voxel data (workaround for missing vertexdata in webshow)

smerdis/pycortex,gallantlab/pycortex,CVML/pycortex,smerdis/pycortex,smerdis/pycortex,gallantlab/pycortex,smerdis/pycortex,CVML/pycortex,gallantlab/pycortex,gallantlab/pycortex,gallantlab/pycortex,CVML/pycortex,CVML/pycortex,CVML/pycortex,smerdis/pycortex