added obo file and cache command

Author: Toby J. Mathieson

pymzml/obo/psi-ms-4.1.79.obo.gz

@@ -346,7 +346,7 @@ def _init_obo_translator(self):
         # required) ...
         if self.info.get("obo_version", None) is None:
             self.info["obo_version"] = "4.1.79"
-        obo_translator = obo.OboTranslator(version=self.info["obo_version"])
+        obo_translator = obo.OboTranslator.from_cache(version=self.info["obo_version"])
 
         return obo_translator