validate_taxmap_funcs

Make sure `funcs` is in the right format and complain if it is not.
NOTE: This currently does nothing.

internal

A set of tools for parsing, manipulating, and graphing data
classified by a hierarchy (e.g. a taxonomy).

<dl><dt>funcs</dt>
<dd>The `funcs` variable passed to the `Taxmap` constructor</dd></dl>

<dl>

<dt>funcs</dt>
<dd>The `funcs` variable passed to the `Taxmap` constructor</dd>

</dl>