HPCC-9990 Add an option to convert SORTED/DISTRIBUTED to ASSERT forms

#option('assertSortedDistributed', TRUE);

will create assertions for both SORTED and DISTRIBUTED i.e. as if the following
was used.

SORTED(ds, ..., ASSERT)
DISTRIBUTED(ds, ..., ASSERT)

Signed-off-by: jamienoss <james.noss@lexisnexis.com>