165 - PV - Remove quot in UKT export file

if "ukt_rpv_export.txt" file is missing, create it, then keep
processing.
Merge pull request #112 from lu-yang/bugfixes/PV-Remove-quot-in-UKT-export-file

165 - PV - Remove quot in UKT export file
Merge remote-tracking branch 'robworth/develop' into features/167-Add-Date-Column-In-Unit-Table