flavour overhaul for PyBlosxom 1.3

Hi guys!

I checked in a bunch of changes to how flavour templates are handled 
today.  Specifically:

  - PyBlosxom checks flavourdir if it's set OR datadir if flavourdir is
    not set.
  - PyBlosxom will handle category flavour template overrides in the
    flavourdir (i.e. if you have flavour templates in flavourdir/dev,
    then we'll look at those before looking in flavourdir if the user
    is looking at items in the /dev category).
  - I added a "flavours" directory to pyblosxom/PyBlosxom.  This
    directory will hold all included flavours that come with PyBlosxom.
    For now, it holds the flavour templates that I extracted from
    pyblosxom/PyBlosxom/renderers/blosxom.py .  (i.e. no more hard-coded
    templates!  yay!)
  - I changed calls from tools.Walk to os.listdir when pulling flavour
    templates.
  - These changes allow site admin to include additional site-wide
    flavours.
  - These changes allow users to override the error flavour.
  - These changes make it possible for us to include more flavours in
    a way that doesn't require additional installation steps.

Anyhow, that's what I was trying to accomplish.  I did some initial 
testing on my local machine (I'm not longer doing development in the same 
instance as my actual blog).

The one non-backwards-compatible issue with this is that date_head.html 
and date_foot.html are no longer provided if you have your own html 
flavour.  I tossed around adjusting for this, but I'm thinking I don't 
think I'm going to bother.

The one big issue with flavours that we still don't handle is how to deal 
with resource content (css files, gif/jpeg/png images, ...).  I think I'm 
going to whip together a plugin to handle that--more on that later.

Any thoughts, comments, and the like are more than welcome.  All changes 
are checked into HEAD (where I'm doing development for PyBlosxom 1.3).  I 
realize I didn't discuss any of these with anybody, but I'm thinking none 
of these are radical departures from PyBlosxom's mission and all of them 
make installation, configuration, and usage much easier.

/will

p.s. Hopefully, this will become a regular thursday-night/friday PyBlosxom 
coding fest.


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