Customize threshold for alignments displayed in Annotate module

[dmacguigan]

Maybe allow user to specify this option, since some taxonomic groups will have higher % sequence divergence

From @dleopold

For the alignments in the Annotate module it currently shows the top hits from the curation process. That will be one or more sequences depending on the blast results. Currently this is filtered in blast using -best_hit_score_edge 0.01. Not sure this is optimal, so open to modifying the filter parameters.

[dmacguigan]

bcccfd0 allows user to filter number of hits, but still need to open up the BLAST "best_hit_score_edge" to dynamic assignment