Norn of Infertility (1.6)

This agent checks for possible immortal and fast-aging Norns and attempts to
keep them infertile.

It does this by checking 4 possible indicators:

1. Norns older than 9 hours may be immortal.
2. Norns with 2 or more toxins in their body over 95 may be immortal.
3. Norns that reached adult before they were 30 minutes old are probably
   fast-agers.
4. Norns with very low levels of energy or ATP may be immortal.

If any of these checks are matched then a "boing" sound will be heard and the
Norn's name that is displayed above the NoK will have 1 or more extra letters
added in front of it followed by a ! as follows:

O = Old
T = Toxins
A = Aging
Z = Zombie (Energy/ATP)

Norns are checked every 5 minutes and are forced infertile every 20 seconds.
Infertility cannot be guaranteed, as fertility rises constantly with time,
though it should greatly reduce the chance of pregnancies. There is also the
possibility that an immortal/fast-ager will warp in and reproduce between the
Norn of Infertility's checks.

Version history
---------------
1.6
- Really (I think) fixed the script error.
1.5
- Possibly fixed an intermittent "invalid targ" script error.
- Added SunlitMiracle's zombie check from her updated Norn Statistics.
- Increased the time the NoI will stay above a flagged Norn.
1.4
- If the NoI tried to check a Norn as it left through the warp then an error
  would occur. This should now be fixed.
- Fast-aging was being checked against the Youth stage instead of the Adult
  stage as was intended. This was still a valid test but has now been changed to
  Adult stage.
- The NoI no longer falls through elevator shafts and upper level floors.
- The agent can now be injected using the C3 creator machine without causing
  errors (or killing the machine if auto-kill is enabled).
1.3
- Fixed an incorrect reference to a "reaper norn" sprite gallery. This agent was
  based on the Reaper Norn which was never released. Damn that cut-n-paste ;)
1.2
- Agent now uses OV variables instead of GAME variables. The remove script still
  removes the legacy GAME variables.
1.1 (not released on site)
- Speeded up the checking of individual Norns using INST.

Emmental
https://github.com/chiizujin/edsa
