translator changes: different types for pseudo-constructors

[Eric Dean Tribble <tribble>]

You can now supply an alternate return type for a pseudo-constructor
and the translator will use that instead.  I used this to replace the
persistentInXPP message which the translator used to tell whether it
should write out the pseudo-constructors of a class with wimpy return
types.  I also explicitly declared all the PCs that returned wimpy
pointers with the old scheme.

dean