Force DOIs to URL form for taxonomic amendments.

[jimallman]

This will convert existing amendments on-the-fly (when fetched) and enforce DOIs-as-URLs when adding or changing a taxonomic amendment.

N.B. This is dependent on the coerce_amendment_dois_to_urls branch of peyotl!

[jimallman]

This is working now on devtree. Tested with multiple taxa in a single new amendment, and fetching old/existing amendments via API (response is converted to use DOIs-as-URLs).

[jimallman]

I should have mentioned above, this addresses OpenTreeOfLife/peyotl#155

[jimallman]

Closing this after self-assignment.

[jimallman]

Note that we've decided on a more restrictive approach that

• coerces DOIs to URLs on input (in the curation app), and
• strictly validates incoming amendments for this (in peyotl)

So these changes (and the underlying peyotl mods) are no longer desired.