Issue errors if a user tries to uses a taxmap option with taxonomy object

[zachary-foster]

There are 4 functions that have been moved from taxmap to taxonomy:

• filter_taxa
• arrange_taxa
• sample_n_taxa
• sample_frac_taxa

These have a few options specific to taxmap. For the purposes of DRY, I will try to have the full functions in taxonomy and check the class used before allowing the options specific to taxmap to be used.

[sckott]

this is for first CRAN push, yes?

[zachary-foster]

I think so, I expect to have it done today. Now there is only one version of those functions in Taxonomy (not in Taxmap), so its actually a little less complicated than overwriting the functions in taxmap like I did originally. Just need to move things around and add some ifs and warnings.

[sckott]

okay, will mark with the milestone