Add TestCases for `teslacrypt.py, unfactor.py`, more file-magics, use hexstr for decrypt-AES

[ankostis]

TCs:

• teslacrypt.py: just compare stats for different option combinations.
• unfactor.py: Check reconstruction of known keys.
• Use bash for chmod to imitate inaccessible-files.
• BREAK the header of "bad-header" tesla-file.

  teslacrypt.py:

• FIX unbound-var when decrypting alone-files from cmd-line!
• FIX unicode-handlings in WinPython-2.7.
• docs: FIX 1st teslacrypt cmd, -v missplaced-option.
• teslacrack.py: minor log also file on unknown keys.
• Add more known-magics (zip, 7z, png, gifs, etc).
  • Check both extension & magic-bytes before accepting positive.
  • test-files: Set the correct file-exts, needed for unfactor.py checks.
  • docs: update explanation about magics.
• Consume AES hex-strings (facilitate TCs).

  unfactorXXX.py:

• Put candidates-keys in list, instead of returning them as help-msgs. Provide help-message when key not found.
• Add TCs for (some) error cases.
• Restruct and logging (facilitate TCs).
• Output decrypted-AES as hex-string (facilitate TCs).
• Use logging throughout.

  All:

• Raise exceptions instead of returning error-msgs (facilitate TCs).
• Ensure main()'s exit-error-code non-zero on errors.
• Standardize main() arguments and

Note that TCs need these libs:

pip install ddt, yaml

and bash for making inaccessible files/dirs for TCs - I suggest to use cygwin.

[ankostis]

@Googulator are you thinking of choosing a License. A copyleft maybe? Sorry, I had mssed it - gpl-v3, great!

[ankostis]

And with 8c3ad4f59a1d, this PR is now "concluded".

• Added ECDSA TC,
• applied main() conventions (agrs, raise errros and exit-codes),
• use logging thoughout,
• ALL TCs RUN OK.

[ankostis]

Is there any problem with the PR?