Changes to Defaults for New Clients

-New clients will no longer begin as a bald, black-eyed, 30 year old.
Instead, they will have a randomized hairstyle, facial hair style, hair
colour (75% of time matches facial hair colour), eye colour, skin
colour, underwear, backpack, and an age between 25 and 35. This only
applies to the initially generated slot.
-New clients will default to assistant if chosen jobs are taken, rather
than default to random job if chosen jobs are taken. This applies to all
slots.

Note that clients with an existing preferences.sav are not affected by
either change.

Additional change is included in this commit to restore job preferences
to two columns, without atmospheric technician appearing in a third
middle column by itself.