Python: URI decoding: now properly checking that paths can be encoded in

ASCII (issue #89)

python/obitools3/uri/decode.pyx

@@ -174,6 +174,9 @@ def open_uri(uri,
              dms_only=False,
              force_file=False):
 
+    if not uri.isascii():
+        raise Exception("Paths must be ASCII characters only")
+            
     cdef bytes urib = tobytes(uri)
     cdef bytes scheme
     cdef tuple dms