Auto-apply matching taxon if ENTER key pressed.

This automatically applies the first *exact* match in taxon-search
results, if the ENTER key is pressed before (or after) results appear.
Addresses #370 in the curation app; next, I'll apply the same behavior
in the main tree-viewer app.
Keep looping, hoping for an exact match
Auto-jump to matching taxon if ENTER key pressed.

This applies the same behavior as in the curation app's taxon search, to
the main tree-viewr app. Addresses #370.
Use case-insensitive taxon matching in both apps.
Tab and arrow key support for search-results menu.

This is in the tree-viewer app, as requested in #468. Will follow up
with matching behavior in the study-curation app.
Support for tab/arrow keys in curation focal-clade.

This mirrors the changes in the main tree viewer app, except that
"natural" tab order is preserved to avoid disrupting accessibility
on the entire page. Addresses #468.
Merge pull request #468 from OpenTreeOfLife/enter-applies-matching-taxon

Enter applies matching taxon