UDF bugs

Not registered There were thread safety issues in datetime functions of the FBUDF library.

fixed by C. Valderrama

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Not registered The UDF AddMonth() in the UDF library FBUDF had a bug that displayed itself when the calculation rolled the month past the end of the year.

fixed by C. Valderrama

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Not registered Diagnostics when a UDF module was missing/unusable needed improvement.

fixed by A. Peshkov

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Not registered There were some problems with the mapping of UDF arguments to parameters.

fixed by N. Samofatov

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Not registered UDF arguments were being prepared/optimized twice.

fixed by D. Yemanov

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SF #544132, #728839 Nulls handling in UDFs was causing problems.

fixed by C. Valderrama

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Not registered UDF access checking was incorrect.

fixed by D. Yemanov

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