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Added new metadata parameter - outfilepatternexpr - to use expressions expressions in file name definition. Expression can contain any string or symbol, RTR-parameter call, conditions, file pattern expressions. Example of usage:
"outfilepatternexpr" : "IIF(StringLength(get_instruction_param('OutputFormat', :GVAR_RTR: != 0), get_instruction_param('OutputFormat', :GVAR_RTR:,get_instruction_param('maxrows', :GVAR_RTR) + '@CORRID@FeedType_MAINEXPR_.@EXT'"
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