(x) delete all occurances of the p_calltype stuff

(x) write check routine to be called before pagein().  Delete
    pagein() return value checking.  [getpage() in vm_machdep.c
    is now used, and does the checks pagein used to do.  This
    same thing also had to be done for vtopte()]

(x) mapin() may have changed between versions.  Check it out.
    [seems to be okay.  Deleted the count argument, though]

(x) go through NFL stuff.  machparam.h may need some defines
    related to this [made new header file fplinkage.h]
