- moved is_of_type and friend macros into utils.h so they can be phased

- moved is_of_type and friend macros into utils.h so they can be phased
  out in one of the next releases.
- rewrote the foo_evalf() functions without TYPECHECK macros.  (Since they
  were not flexible enough and some functions need more flexibility than
  can be provided by such macros.  They are evil anyways.)
- marked the TYPECHECK macros as evil^H^H^H^Hdeprecated.
- implemented a more flexible scheme for some foo_evalf() functions, notably
  zeta(3.0) eval's to a float now while zeta(3) doesn't eval, just as is
  usual for all the trigonometric functions.
- this day is very hot.