[enh] suggestion support added

searx/engines/__init__.py

 def default_request_params():
     return {'method': 'GET', 'headers': {}, 'data': {}, 'url': '', 'cookies': {}}
 
-def make_callback(engine_name, results, callback, params):
+def make_callback(engine_name, results, suggestions, callback, params):
     # creating a callback wrapper for the search engine results
     def process_callback(response, **kwargs):
         cb_res = []
             return
         for result in search_results:
             result['engine'] = engine_name
+            if 'suggestion' in result:
+                # TODO type checks
+                suggestions.add(result['suggestion'])
+                continue
             cb_res.append(result)
         results[engine_name] = cb_res
     return process_callback
     global engines, categories, number_of_searches
     requests = []
     results = {}
+    suggestions = set()
     number_of_searches += 1
     user_agent = request.headers.get('User-Agent', '')
 
         request_params['started'] = datetime.now()
         request_params = engine.request(query, request_params)
 
-        callback = make_callback(selected_engine['name'], results, engine.response, request_params)
+        callback = make_callback(selected_engine['name'], results, suggestions, engine.response, request_params)
 
         request_args = dict(headers = request_params['headers']
                            ,hooks   = dict(response=callback)
         for res_engine in result['engines']:
             engines[result['engine']].stats['score_count'] += result['score']
 
-    return results
+    return results, suggestions
 
 def get_engines_stats():
     pageloads = []

searx/webapp.py

         for categ in selected_categories:
             selected_engines.extend({'category': categ, 'name': x.name} for x in categories[categ])
 
-    results = search(query, request, selected_engines)
+    results, suggestions = search(query, request, selected_engines)
     for result in results:
         if len(result['url']) > 74:
             result['pretty_url'] = result['url'][:35] + '[..]' + result['url'][-35:]
                         ,q=request_data['q']
                         ,selected_categories=selected_categories
                         ,number_of_results=len(results)
+                        ,suggestions=suggestions
                         )
     resp = make_response(template)
     resp.set_cookie('categories', ','.join(selected_categories))