Remove Query->qry_aggs and qry_numaggs and replace with Query->hasAggs.

Remove Query->qry_aggs and qry_numaggs and replace with Query->hasAggs.

Pass List* of Aggregs into executor, and create needed array there.
No longer need to double-processs Aggregs with second copy in Query.

Fix crash when doing:

	select sum(x+1) from test where 1 > 0;