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

_concepts_default.txt

@@ -27,15 +27,19 @@ def concept x has a y as hasa(x,y) pre is_question()
 def concept x has an y as hasa(x,y) pre is_question()
 # no need to auto eval as it's a question
 
+# AND
 def concept x and y as x and y pre is_question()
 set_is_lesser(__PRECEDENCE, c:x and y:, 'Sya')
 set_is_less_than(__PRECEDENCE, c:q:, c:x and y:, 'Sya')
 
+# OR
 def concept x or y as x or y pre is_question()
 set_is_lesser(__PRECEDENCE, c:x or y:, 'Sya')
 set_is_greater_than(__PRECEDENCE, c:x and y:, c:x or y:, 'Sya')
 set_is_less_than(__PRECEDENCE, c:q:, c:x or y:, 'Sya')
 
+def concept the x ret memory(x)
+
 # default
 def concept male
 def concept female
@@ -46,6 +50,10 @@ woman is a female
 def concept human
 man is a human
 woman is a human
+def concept boy
+def concept boys
+def concept girl
+def concept girls
 
 # days of the week
 def concept monday