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

lib/resource-1.4/mathematical/MathematicalIta.gf

@@ -0,0 +1,26 @@
+--# -path=.:present:prelude
+
+concrete MathematicalIta of Mathematical = 
+  NounIta - [ComplN2], --- to avoid ambiguity 
+--  VerbIta, 
+  AdjectiveIta,
+  AdverbIta,
+  NumeralIta,
+--  SentenceIta,
+  QuestionIta,
+  RelativeIta,
+  ConjunctionIta,
+  PhraseIta,
+  TextX - [Tense,TPres,TPast,TFut,TCond],
+  IdiomIta,
+  StructuralIta,
+
+  SymbolIta,
+  PredicationIta, --  - [predV3,predV2], --- gf bug
+
+  LexiconIta
+  ** {
+
+flags startcat = Phr ;
+
+} ;