Added a *chirp sound for diona nymphs.
Jobs you can't select are struckthrough instead of just being red.

Before:  It's going to be kinda confusing when a new player goes to setup their jobs and they see this: http://i.imgur.com/miK9Isk.png
Specifically "unavailable occupations are in red" and then a list of days till they can play that role but also RED [NEVER] which to a new player migth cause confusion thinking
they can never play that role.

After:  Remove the red and add a strikethrough ( http://i.imgur.com/BQ90xr6.png  ) to show "these jobs are unavailable" while making the other jobs look, well more available.

Conflicts:
	code/modules/client/preferences.dm