Add option allowAutoAssignPersonnel

Probably best used by forgetful or lazier players.  Micromanagers would not be interested in this.

Scientists and engineers are put to work on ongoing projects/productions
as soon as they arrive on base.  No more lost productivity.

<strike>Soldiers are assigned to craft with free space when they recover from
wounds; arrive at a base; survive a base defense or a craft returns from
a mission. Rookies are placed at the front of the craft (In chess, the pawns go first).
Saves on clicks.</strike>

If after a day of no research, perhaps because the player forget to choose the next research topic, scientists pick one at random.

Similarly, if there's no manufacture going on then after a while engineers will pick something modest to make, that is something without requirements and is not a craft, so that will probably be a medikit or a laser weapon.