nighttime

added interaction with WEATHER.NIGHT. I don't know what the summative
file is, or how that works, or something, because I moved it, and now
it's broken or sommat and I don't know. I don't think I changed anything
in it, though.

Moving on, animals now sleep (that is, do nothing except increment
hunger and thirst) at night. Plants have their own interaction, with
involves not increasing their regeneration or reproduction time (because
no photosynth)

additionally, plants will now lower their thirst when they're next to
water (overlooked before)

also, they will die when their thirst reaches a certain negative level,
that is, drowning. This will happen to plants in water immediately, and
plants next to water after 10 turns of continuous rain, or some arcane
number of turns of discontinuous rain, depending.