Open Library search API

If nothing is found on the server, returns results from open library
API. Clicking on a book imports it.

front/src/BookForm.vue

@@ -107,6 +107,7 @@
       <h3 class="subtitle">{{data.author}}</h3>
       <p>{{data.summary}}</p>
       <div class="my-5" v-if="data.isbn">ISBN: {{data.isbn}}</div>
+      <div class="my-5" v-if="data.openlibraryid">OLID: {{data.openlibraryid}}</div>
     </div>
     <div class="column">
       <div class="iconscontainer" :class="data.read ? 'remove-border-bottom' : ''">