Fix anndata concatenation #416
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The way the concatenation was previously implemented, the tuple grouping in
H5AD_CONVERSIONgrouped the anndata files by the entiremetamap, which did not result in any actual grouping. Then, the "grouped" anndata object was saved ascombined_<raw/filtered>.h5ad, which gives the impression that it should contain the raw/filtered data for all samples. In fact it always contained only one sample.This PR fixes this behaviour and introduces the shared empty droplet calling subworkflow with scdownstream