Critical minor fixes in informix dialect - patch attached

Informix dialect didn't worked at all cause of error in dbms version checking at dialects/informix/informixdb.py Also fixed visitor_function in dialects/informix/base.py (it wasn't accepting **kwargs and breaks with some functions). Also informix (at least versions <11) does not support subqueries (at least in direct way), but this could be avoided by using table(multiset(SUBQUERY)).Added visitor_select with version checking. Old visitor_select also breaks the execution of complicate statements and was removed at all.

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