A medium sized PR that fixes a very weird/annoying bug in #C062H82UCRG https://github.com/nf-core/createtaxdb/pull/202 Basically: 1. Replaces three cases of

groupTuple

with

groupBy

2. Moves a big portion of the

<http://createtaxdb.nf|createtaxdb.nf>

to a dedicated subworkflow (looks big, isn't really)