Stefan Peidli

Also see issue #18. - Rename function "edist" to "pairwise_...". - Provide useful error message when giving "control" keyword to the pairwise function.

"In case the perturbation status is only found in 1 cell, scPerturbR does not give you an error message about the number, but rather it complains `Error in res$p.value :...

https://doi.org/10.1016/j.cell.2023.11.005

https://doi.org/10.1038/s41587-021-01059-3

https://doi.org/10.1016/j.cell.2023.11.005

### Description of feature Should be relatively easy given that we already have Milo implemented. See https://github.com/MarioniLab/miloDE for R

### Description of feature Currently we only have a greedy guide assignment method implemented. It would be nice to have more to choose from.