HPCC-10142 queryLogicalFilename not supported on hthor

In Hthor
    Fix multi part logical file processing for both subfiles belong to a
    superfile and single logical file

In Regression Suite
    Add deistributed file generation into thor setup
    Add thor specific setup key file
    Add platform specific keyfiles for issue10142.ecl

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
numPartCopies tells you how many redundant copies of a single file there are, I thought (in which case you do NOT want to process all of them!)