Global db for CH region

[tdivoll]

@BethanLittleford

CH is inclusive of GH; do we need to create a global ref db for the CH region?

[BethanLittleford]

We do need to create a reference library for c/h primers, but we need to think about how best to do this as many trnL sequences uploaded to NCBI won't have the c primer included. I think we are going to try and tackle this in one of the metabarcoding meetings. @tkartzinel @tdivoll