merged from vega-44-dev - project DAS slice onto toplevel if it isn't already
merged from vega-44-dev - project DAS slice onto toplevel if it isn't already

Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode