Fixed #43 : BnfNodeParser: I can recognize when multiple level of ISA

Fixed #44 : BnfNodeParser: I must simplify results when multiple levels of ISA
Fixed #45 : Dynamic variables cannot be parsed at restart
Fixed #46 : Concepts variables values are transformed into list by default
Fixed #47 : SheerkaAdmin. Add min, max, mean time when restoring files

src/core/sheerka/services/SheerkaExecute.py

@@ -368,7 +368,8 @@ class SheerkaExecute(BaseService):
             if pi is NotFound:  # when CacheManager.cache_only is True
                 pi = ParserInput(text)
                 self.pi_cache.put(text, pi)
-            return ParserInput(text, tokens=pi.tokens, length=pi.length)  # new instance, but no need to tokenize the text again
+            return ParserInput(text, tokens=pi.tokens,
+                               length=pi.length)  # new instance, but no need to tokenize the text again
 
         key = text or core.utils.get_text_from_tokens(tokens)
         pi = ParserInput(key, tokens=tokens, length=len(tokens))
@@ -705,9 +706,8 @@ class SheerkaExecute(BaseService):
             # disable all parsers but the requested ones
             if parsers != "all":
                 sub_context.preprocess_parsers = parsers
-                # sub_context.add_preprocess(BaseParser.PREFIX + "*", enabled=False)
-                # for parser in parsers:
-                #     sub_context.add_preprocess(BaseParser.PREFIX + parser, enabled=True)
+            else:
+                sub_context.preprocess_parsers = None
 
             if prop in (Keywords.WHERE, Keywords.PRE, ConceptParts.WHERE, ConceptParts.PRE, Keywords.WHEN):
                 sub_context.protected_hints.add(BuiltinConcepts.EVAL_QUESTION_REQUESTED)