shipspeed should be in ship.c, not in config.c
config cleanup contd.
createunit => create_unit, everywhere.
make_undead_unit in zombies.c
remove dead code, move weight(unit) to unit.c
kill gc_add and gc_done, they were terrible ideas.
fix floating point exception.
limit eternath gates to 1-person units, avoid crash
Merge branch 'version-3-3'

Conflicts:
	src/build.h
clarify some parsing code that valgrind complains about.
Merge pull request #92 from badgerman/master

miscellaneous refactoring