restored multimodal and mathematical sources

lib/resource-1.0/mathematical/MathematicalFre.gf

@@ -0,0 +1,26 @@
+--# -path=.:present:prelude
+
+concrete MathematicalFre of Mathematical = 
+  NounFre - [ComplN2], --- to avoid ambiguity 
+--  VerbFre, 
+  AdjectiveFre,
+  AdverbFre,
+  NumeralFre,
+--  SentenceFre,
+  QuestionFre,
+  RelativeFre,
+  ConjunctionFre,
+  PhraseFre,
+  TextX,
+  IdiomFre,
+  StructuralFre,
+  
+  SymbolFre,
+  PredicationFre - [predV3], ---- gf bug
+
+  LexiconFre
+  ** {
+
+flags startcat = Phr ;
+
+} ;