this.html_row_wkr=newSrch_html_row_wkr(html_row_bldr,js_wkr,qry.Slab_end-qry.Slab_bgn,wiki.Domain_bry());// NOTE: must set member reference for html_row_wkr else On_rslts_found will fail with null ref when async_db is false; DATE:2016-12-22
if(async){// NOTE: async useful with multiple wikis; allows parallel searches;