update: Fix work inconsistency with neweff, production

update: Fix work inconsistency with neweff, production

In Empire, even babies work.

neweff and production compute the projected population's work,
discarding fractions.

The update first computes the adults' work (discarding fractions),
then newborns' work (discarding fractions), then adds them together.
Double rounding.  Moreover, it uses the old work percentage for the
adults' work, and the new one for the newborns' work.  Broken in
Empire 3.

Fix by recomputing work after grow_people().  This is how things
worked before the regression.  Also restores a bug: growfood()'s work
use is ignored.  Harmless, because fcrate and fgrate are too low for
growfood() to produce anything, and nobody customizes them.  Mark
FIXME anyway.

Update test output changes as expected: available work differs in
sectors where double rounding discards work, an in sectors with
changing work percentage.

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>