Patch from xavier.bestel@free.fr to fix bug 83994.  Properly escapes filenames in location= when converting them to U...

Original commit message from CVS:
Patch from xavier.bestel@free.fr to fix bug 83994.  Properly escapes
filenames in location= when converting them to URIs.  There are subtle
namespace clashes between URIs and filenames, but they're mostly
stupid.