HPCC-10740 Document how to override default width

Fixes HPCC-10740

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #21 from GordonSmith/HPCC-10740

HPCC-10740 Document how to override default width

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>
Merge pull request #22 from ghalliday/issue11886

HPCC-11886 Add classes to the performance tests to allow subsets to be run

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>
HPCC-11925 Add some smart join tests to the regression suite

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>