started embedding Predication in the big translation grammar

lib/src/experimental/RGLBase.gf

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+abstract RGLBase = 
+
+-- modules in Grammar, excluding Structural, Verb, Sentence, Question
+----  Tense,
+  Noun - [PPartNP],               -- to be generalized
+  Adjective,
+  Numeral,
+  Conjunction,
+  Adverb,
+  Phrase - [UttS],
+----  Sentence,
+----  Question,
+  Relative,
+----  Idiom [NP, VP, Cl, Tense, ProgrVP, ExistNP, SelfAdvVP, SelfAdVVP, SelfNP], ---- why only these?
+
+  Symbol [PN, Symb, String, CN, Card, NP, MkSymb, SymbPN, CNNumNP] ;          ---- why only these?
+
+----  Construction,
+----  Extensions,
+----  Documentation ;