Further fix for JENA-1003
Further fix for JENA-1003

- Avoid checking temporary directory if unknown
- Remove PipeViewer (pv) support as it has proven to be horribly broken
  under many environments

apache/jena,samaitra/jena,apache/jena,apache/jena,CesarPantoja/jena,apache/jena,kidaa/jena,samaitra/jena,kidaa/jena,apache/jena,CesarPantoja/jena,CesarPantoja/jena,CesarPantoja/jena,samaitra/jena,kidaa/jena,kidaa/jena,CesarPantoja/jena,samaitra/jena,CesarPantoja/jena,kidaa/jena,apache/jena,kidaa/jena,apache/jena,CesarPantoja/jena,samaitra/jena,samaitra/jena,samaitra/jena,kidaa/jena,apache/jena