Show multiple of each type of ISBN in omniline

[jimchamp]

Closes: #6360

The previous means of getting ISBNs for the books page omniline only gets the first ISBN 10 and ISBN 13 if multiples exist for either. This PR ensures that all ISBNs are displayed in the omniline.

Technical

The new code is modeled after the display_identifiers function, which is used to display IDs in the book details section of the page. I'm assuming that the openlib- checks are not needed for ISBNs, and did not include them. Please correct me if I'm wrong.

openlibrary/openlibrary/templates/type/edition/view.html

Lines 141 to 159 in a112a9e

	$def display_identifiers(label, ids, itemprop=None):
	$if label != "Goodreads":
	$ all_ids = [-1!=id['value'].find('openlib-') for id in ids]
	$if (True in all_ids) and (1==len(all_ids)):
	$return
	<!-- FIXME: Identifier names need to be translated (I18N) -->
	<dt>$label</dt>
	<dd class="object" $:cond(itemprop, 'itemprop="%s"' % itemprop, '')>
	$for id in ids:
	$ sep = cond(loop.last, "", ", ")
	$if -1 != id.value.find('openlib-'):
	$continue
	$if id.url:
	<a href="$id.url$('?tag=' + affiliate_id('amazon') if 'amazon.' in id.url else '')">$id.value</a>$sep
	$else:
	${id.value}$sep
	</dd>

Testing

Screenshot

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