Load only NUM words from input wordlist or use 0 to disable

Most people dont think and just throw their biggest wordlist on prince.
That's not how prince is supposed to be used.
Let's help them in their ignorance a bit.
For people that know what they do, they can use the 0 parameter to disable this check.

Merge pull request hashcat#36 from magnumripper/master

Vary hash size depending on length, for more effective use of memory.

Simplify some code, sacrifice a few promiles of speed

Fixed major bug where all candidates are of the same length till chai…

…n changes

Fixed changelog

Changed default value for --pw-max from 24 to 16 for much startup time