Index should check that there are no duplicate read names

[mbhall88]

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My feeling is that if we see two sequences with the same name we should raise an error. A lot of other bioinf tools also exhibit this behaviour. I think it also saves bigger unexplained issues (like this one) arising further down the analysis road.

Originally posted by @mbhall88 in https://github.com/rmcolq/pandora/issues/126#issuecomment-492161063

[mbhall88]

@leoisl given you are working on index at the moment maybe it makes sense for you to add this in?

[leoisl]

Yeah, I will take care of it after #23

[leoisl]

Update: I am not taking care of this right after #23

This has low priority, moving towards finishing learning pandora index, map and compare to try to make the most of the fact that Rachel is still here (without her, I am sure it would be way slower for me to understand index).