Authorities crash in Shadow with 0.3.2.9 because it's 1970 due to new HS code

(I'm still fact checking this ticket if this parenthetical is still here)

hs_get_time_period_num is called in the first 3 minutes of a Shadow simulation.

Shadow starts time at the unix epoch. So the function would ultimately calculate it is time period zero if it wasn't for a fatal assert in the middle of the function preventing that from happening.

I like the idea of inflating time period numbers, perhaps with a better-thought-out version of this patch http://paste.debian.net/1005897/

I've also been talking to Rob about time keeping in Shadow, and it actually may not end up being that bad starting time at, say, y2k instead of 1970.

So I'm not sure what codebase should get fixed at this time.