util: add helper function isatty(fd) to check for tty-ness

web: prevent TypeError thrown when using the diffstat templates Remove the lambda used to wrap webutil.diffstat because: - functions passed to the templater must accept keyword arguments - webutil.diffstat is a generator, so already calculates the diffstat lazily This reverts the changes made to 1d3e2349304a after it was submitted to the mailing list but before it was queued.

fileset: fix long line