restored mathematical in 1.4; forgave some lock fields in overload resolution

lib/resource-1.4/mathematical/MathematicalDan.gf

@@ -0,0 +1,27 @@
+--# -path=.:present:prelude
+
+concrete MathematicalDan of Mathematical = 
+  NounDan - [ComplN2], --- to avoid ambiguity 
+--  VerbDan, 
+  AdjectiveDan,
+  AdverbDan,
+  NumeralDan,
+--  SentenceDan,
+  QuestionDan,
+  RelativeDan,
+  ConjunctionDan,
+  PhraseDan,
+  TextX,
+  IdiomDan,
+
+  StructuralDan,
+
+  SymbolDan,
+  PredicationDan,
+
+  LexiconDan
+  ** {
+
+flags startcat = Phr ;
+
+} ;