We ignore *.pyc, vim swap files, build results under BUILD/ and Lexicon.pickle

This is handy, because otherwise, say after runtest.py run, 'hg status' shows
lots of unrelated info, thus lowering signal-to-noise ratio.

make test for new style exceptions run on all Python versions by not actually testing for new style exceptions :)

another Main.parse() cleanup to make sure a unicode error really comes from the parser, not from the filename decoding

--HG--
rename : tests/broken/getattr3call.pyx => tests/run/getattr3call.pyx

I didn't realize how unclean the seperation between the two was, hopefully Dag's project will clean this up soon.