Improvements to --crack, fixes for installed wordlist

--crack improvements:

• Supports john, hashcat, aircrack, or cowpatty
  • Pyrit appears to not work for me at all right now, even after downgrading scapy (see [this thread]
  • Only passes --force into hashcat if no devices are found.(JPaulMora/Pyrit#558 (comment))).
• Only shows available tools, explains why some tools are unavailable (missing dependencies).
• Accepts all as input when selecting handshakes.
• Avoids writing the same cracked password to cracked.txt if it's already been cracked (same bssid, essid, password, handshake, everything).

Wordlist location when using sudo python setup.py install did not match the wordlists checked by the config. Fixed in this version.