HPCC-10040 Increase blockSize value to avoid "End of record not found..."
exception during XML spray

Rework after rewiev.
Increase maximum record size to 0x100000 (1MB).

Signed-off-by: Attila.Vamos <attila.vamos@gmail.com>
Merge branch 'HPCC-10040-improvement' of github.com:AttilaVamos/HPCC-Platform into HPCC-10040-improvement
HPCC-10040 Increase maxRecordSize value to avoid "End of record not
found..." exception during XML spray

Update after second review.

Signed-off-by: Attila.Vamos <attila.vamos@gmail.com>