use download caching in ALMA

Author: keflavich

astroquery/alma/core.py

@@ -357,7 +357,7 @@ def download_files(self, files, cache=True):
         downloaded_files = []
         for fileLink in unique(files):
             filename = self._request("GET", fileLink, save=True,
-                                     timeout=self.TIMEOUT)
+                                     timeout=self.TIMEOUT, cache=cache)
             downloaded_files.append(filename)
         return downloaded_files