Released search widget on public urls

for OpenSourceFieldlinguistics/FieldDB#1051

Whats new:
* corpora can have well documented terms of use for OpenSourceFieldlinguistics/FieldDB#207 right on their sharable public urls @hisakonog take a look and see if the default terms of use are okay
* the new search widget is live, it lets you index your corpus, and run searches online
 * currently supports only field:substring searches eg morphemes:naya