Comment 1 for bug 329845

I have two fixes in my branch (<lp:~malept/bzr-pager/bugfix.329845>, linked to this bug). The first revision (r9) avoids using the pager if sys.stdout does not have the 'isatty' attribute (e.g., bzrtool's DiffWriter). The second revision (r10) enables proper support for `bzr cdiff` by detecting if sys.stdout is a DiffWriter.