restored multimodal and mathematical sources

resource-1.0/multimodal/MultimodalFre.gf

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+--# -path=.:present:prelude
+
+concrete MultimodalFre of Multimodal =
+  NounFre,
+--  Verb, 
+  AdjectiveFre,
+  AdverbFre,
+--  NumeralFre,
+--  Sentence, 
+--  Question,
+--  Relative,
+--  Conjunction,
+--  Phrase,
+--  Tensed,
+  StructuralFre,
+  DemonstrativeFre,
+  LexiconFre
+  ** {} ;
+