Fixed #125: SheerkaErrorManager

Fixed #135: Change services service priorities
Fixed #136: ErrorManager: Implement recognize_error
Fixed #137: BNFNodeParser : Error when parsing regex with sub parsers
Fixed #138: get_last_errors(): real errors sources are lost
Fixed #139: OneError return value removes the origin of the error
Fixed #140: Concept variables are not correctly handled when parsing sub expression
Fixed #143: Implement has_unknown_concepts()

src/cache/FastCache.py

@@ -16,6 +16,15 @@ class FastCache:
     def __contains__(self, item):
         return self.has(item)
 
+    def __iter__(self):
+        yield from self.cache
+
+    def __next__(self):
+        return next(iter(self.cache))
+
+    def __len__(self):
+        return len(self.cache)
+
     def put(self, key, value):
         if len(self.cache) == self.max_size:
             del self.cache[self.lru.pop(0)]