Fixed #61 : SheerkaDebugManager: Add get_value()

Fixed #60 : Hash error when ReturnValue is a list of list
Fixed #59 : Implement smart_get()
Fixed #58 : SheerkaPromptCompleter: Cannot parse concept token
Fixed #57 : SheerkaPrompt: Add concept autocompletion
Fixed #56 : automatically backup command
Fixed #54 : I can record execution status
Fixed #53 : ConceptManager: modify_concept fails

sheerka_backup/python.sb

@@ -0,0 +1,6 @@
+push_ontology("english")
+def concept x is a string pre is_question() as isinstance(x, str)
+def concept x is a integer pre is_question() as isinstance(x, int)
+def concept x starts with y pre is_question() where x is a string as x.startswith(y)
+def concept sha256 from bnf r'[a-f0-9]{64}'
+def concept sha512 from bnf r'[a-f0-9]{128}'