Fix pipe from results

Don't lose first row
Ignore []s
Switch to use roqet -t for reading rdf and turtle results

(read_query_results_file): Renamed from read_srx_results_file
Allow empty rows.
Anonymize blanks

(run_test): Use read_query_results_file to read rdf/xml and turtle
results.
Remove unused read_rdf_results_file