Added SheerkaComparisonManager

src/cache/CacheManager.py

@@ -259,3 +259,11 @@ class CacheManager:
                     self.caches[cache_name].cache.init_from(content)
 
         return self
+
+    def reset(self, cache_only):
+        """For unit test speed enhancement"""
+        self.cache_only = cache_only
+        self.caches.clear()
+        self.concept_caches.clear()
+        self.is_dirty = False
+