Read and write null mask into external tables
---------------------------------------------

                 Key: CORE-3438
                 URL: http://tracker.firebirdsql.org/browse/CORE-3438
             Project: Firebird Core
          Issue Type: Improvement
            Reporter: Dimitry Sibiryakov


This improvement will allow keep NULLs in external tables without dirty tricks.
After implementation of CORE-3437, external tables, defined with not-null 
fileds only, will be backward compatible with old files without null mask 
inside.

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