HPCC-8932 Move getMinRecordSize() to IRecordSize

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
HPCC-8932 workunits are incompatible, so increase the version number

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #4091 from ghalliday/issue8932

HPCC-8932 Move getMinRecordSize() to IRecordSize

Reviewed-By: Jake Smith <jake.smith@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>