add --quiet argument to improve performance

Author: jedwards4b

manic/repository_svn.py

@@ -260,7 +260,7 @@ def _svn_checkout(url, repo_dir_path, verbosity):
         """
         Checkout a subversion repository (repo_url) to checkout_dir.
         """
-        cmd = ['svn', 'checkout', url, repo_dir_path]
+        cmd = ['svn', 'checkout', '--quiet', url, repo_dir_path]
         if verbosity >= VERBOSITY_VERBOSE:
             printlog('    {0}'.format(' '.join(cmd)))
         execute_subprocess(cmd)