Merge lp://qastaging/~ijk/gtimelog/nutmeg into lp://qastaging/~gtimelog-dev/gtimelog/trunk

This:

+ subject = 'Weekly report for {} (week {:0>2})'.format(who, week)

means a UnicodeEncodeError if who is a unicode string with non-ASCII characters.

Although testing reveals that currently `who` is a byte string, which causes bug 1117109, so this doesn't make anything worse.

(It also drops support for Python 2.6 or older, which is probably fine. We'll see if anyone complains about that.)

There are some minor PEP-8 transgressions that I'll fix up after merging.

(Ick, launchpad's review UI sucks. Why haven't I moved to github already?)

Actually, wait a second:

        xdg = os.environ.get('XDG_CONFIG_HOME')
        if xdg is not None:
            return os.path.expanduser(xdg)
        else:
            return os.path.expanduser("~/.config/gtimelog")

so if I set XDG_CONFIG_HOME=~/.config, then gtimelog will use ~/.config/gtimelogrc?

Shouldn't that be

        xdg = os.environ.get('XDG_CONFIG_HOME')
        if xdg is not None:
            return os.path.join(os.path.expanduser(xdg), 'gtimelog')
        else:
            return os.path.expanduser("~/.config/gtimelog")

and likewise for the data dir?

Also, should it really pass the value of the environment variable through os.path.expanduser()?