client-test: leak in check_users() + cosmetics
client-test: add various errors test
client-test: cosmetics
client-test: hide unwanted sx error message
client-test: leak in test_errors()
client-test: check volumes
client-test: add file revision removing test
client-test: use sxc_file_from_url() sometimes
client-test: do both fclose() and unlink()