archiver: escape urls

so anything with spaces or áéíóúñ or any unicode will work

sources/cmd/archiver/archiver.go

@@ -900,10 +900,22 @@ func prepareKeyString (_context *context, _namespace string, _fingerprint string
 }
 
 
+func pathEscape (_path string) (final string) {
+	fragments := strings.Split(_path, "/")
+	for i, fragment := range fragments {
+		final = final + url.PathEscape(fragment)
+		if i != len(fragments) - 1 {
+			final = final + "/"
+		}
+	}
+	return
+}
 
 
 func walkPath (_context *context, _pathResolved string, _pathInArchive string, _name string, _recursed map[string]uint, _recurse bool, _statusPerhaps uint) (os.FileInfo, error) {
 	
+	_pathInArchive = pathEscape(_pathInArchive)
+
 	if _recursed == nil {
 		_recursed = make (map[string]uint, 128)
 	}