Old tests cleanup

 * Convert some non test_*.py tests to remove dependency on tester.py and remove tester.py.
 * Update bench_cffi_access.py, large_* and make_hash.py.
  *  * The second test in each of large_* created an image of size (XDIM, XDIM). I changed this to (XDIM, YDIM) like the first test. Is this correct?
 * Remove  run.py.
 * Update README.