test-check-code-hg: fix xargs exit status on OSX When xargs subcommand invocation fails in a normal way, GNU xargs returns 123 and BSD one returns 1.

largefiles: respect store.createmode and avoid extra file copy Before, a tempfile was used to create a temp file was created with 600 permissions and the uploaded data was written into it. This file was then *copied* to .hg/largefiles/<hash>. We now simply use atomictempfile to write the data to a temp file with the right permissions and then rename that into place.

largefiles: respect store.createmode in basestore.get This replaces another use of tempfile with atomictempfile. The problem with tempfile is that it creates files with 600 permissions instead of respecting repo.store.createmode.