Debug generate_tfim_samples()

This release fixes various bugs in generate_tfim_samples(), to bring it into line with the approach that's validated in tfim_validation.py. Now, using this function in the validation script, we have a direct test to show it is implemented correctly.

Full Changelog: v9.7.7...v9.7.8

sha1sum results:
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02b62ca32218cb4ef5f071a02d2c56fb6b12a350 pyqrackising-9.7.8.tar.gz