[PATCH] a whole lot of little patches

[Douglas Bagnall]

These are mostly due to me running the likes of:

  find -name '*.py' |grep -v 'pep8' |xargs pyflakes |  grep ': undefined name'

I *tried* to ignore ./thirdparty and ./examples, but I accidentally fixed 
a couple of things there.

I've also taken the liberty of .gitignoring some dot-files that various tools
like to create, and tuned one of the performance test scripts to be less slow.

One of the patches removes a bit of the non-functional Python selftest that I
missed last time.

An argument you could make against these patches is they clearly reveal parts
of the codebase that are not covered by tests, and we should really be fixing
that at the same time.

Douglas
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