- add two new defaults: FVSUseKeychain, FVSCreateRecoveryKey
- this represents a behaviour change, but adheres more faithfully to the
  fdesetup cmdline options
- fix undef symbols linker error
- fixed a poroblem that was preventing fdesetup err msgs from reaching
  the main window
- removed some cruft
- clean up a memory leak in the password match routine
- revise credits (Thanks, Rich!)