Bugfixes and improvements

I know we're a bit quiet on the PR front, but as usual a lot is happening under the hood. You can see what we're up to by watching Launchpad, e.g., Divisi trunk and ConceptNet trunk. I'll highlight a few recent examples:

1. Divisi works on Windows. According to Akshay. We haven't tried it. Though properly supporting Windows means a double-click .exe installer -- which setuptools can apparently make, but we haven't figured out yet.
   
2. We finally renamed u_distances_to to u_dotproducts_with in SVD results; the name has been wrong ever since I wrote that code maybe a year and a half ago.
3. I wrote csc.divisi.util.PickleDir, which I've found really helpful for hanging onto temporary data that's a little longer-lived than an ipython session.
4. I improved how Divisi summarizes SVD results (in two commits).
5. I refactored how Analogyspace is built, making it easier to try out different combinations of things. Object-oriented code definitely improves things, but I still don't think I hit the sweet spot; certain customizations are still too hard. Any input from software architects? It's a set of mostly composable operations, though certain things only make sense in certain cases...
   
6. top_items had been effectively ignoring its new key parameter. Fixed.
7. We had been returning squared magnitudes for tensors. Oops. Fixed. Fortunately, I don't think this was used.
8. Finally got around to implementing the (pretty trivial) decomposition of a vector into the parallel and perpendicular components to another vector. That required filling out some other routines, fixing tests, etc.; I think they call that 'yak shaving'; my real goal was to figure out why AnalogySpace was coming out differently than a few weeks ago.
9. All this stuff is begging a new release. In time... for now, you can use the bzr head; we try not to break the trunk too often.
   

We also have a bunch of awesome documentation that hasn't gotten linked to in the main pages (e.g., conceptnet.media.mit.edu). More yak shaving: I went to edit the page and realized that we hadn't committed our local website changes into our web svn, so I committed some things, running into a svn bug and writing about it. But before I linked to the docs, I really wanted to move them to csc.media/docs, but that required mucking with the Apache configuration. I remembered that we had wanted to try out nginx, so I got that set up on a backup port on the server and got a dynamic site (csc.media) configured for it. I actually should have just stuck to getting the static config working and forward to Apache for the dynamic config, because that's what each is good at! Anyway, that required futzing with a fastcgi socket permissions issue (I tried using a Unix domain socket -- cool things, but as documented, they have permissions issues.) etc., etc.

I had planned to work on my thesis, but... speaking of thesis, Jayant just graduated. Thankfully he's staying a little while longer to wrap things up, so maybe he'll post something about his thesis.