Dali Clock 2.38

I fixed a few preferences-related bugs, and most importantly, I think I figured out the build options so that the binaries should work on any Intel Mac from 10.5 and onward. (But not PPC, sorry.)

Let me know if you discover any problems.

I'm not pushing out a new iOS release, because I don't think I've changed anything that will affect that. (But do let me know if the 2.37 version in the app store doesn't work on your old phone.)