Tweaked hacking alarm time and node count.

Spent a while fine tuning it. I can usually hack a console in under a
minute. Extra minute is to give fresh hackers a chance.

Node count 6 is a reasonable amount. Isn't too easy, isn't too
difficult. Harder to bruteforce than 4 nodes.
Merge pull request #40 from NightmareX91/master

Tweaked hacking alarm time and node count.