Better Verboseness

• Add wordlist descriptions
• List built-in wordlists with -D
• BREAKING: Rename -w/--wordlist to -f/--file
• BREAKING: Add -w as an alias to -d
• Add -c as an alias to -n
• Emit verbose information to stderr
• Add dictionary and attack time estimates to verbose mode
• Use bignum to calculate combinations
• Space-separate Koremutake passwords
• Wrap help text