Merge pull request #1 from Cadair/master

Here you go
Just a few small changes.

Scrapped PATCHLEN and set a value for the kernel size.
Also renamed some variables, partly so they have more descriptive/relevant names
and partly for consistency between functions.
Fixed Leonard's four-variables-one-object cock-up.
Added test script for aff_tr_stu.py
Initial tests completed

test_aff_tr.py now shows that aff_tr_stu.py can reproduce the functionality of aff_tr.c.
Added pyrot.py which defines new rotate function
More extensive testing.
0.006, and no faster