1.0.0.27: various PCL cleanups in cache.lisp

1.0.0.27: various PCL cleanups in cache.lisp
  * ALLOCATE-CACHE-VECTOR was unused -- deleted
  * better GET-CACHE-VECTOR
  * don't bind VECTOR as a local function
  * drop a few useless (THE FIXNUM)s
  * use REMHASH to clear out OWRAPPER from *PREVIOUS-NWRAPPERS*
    instead of just setting its value to NIL.
  * inline COMPUTE-LINE-SIZE
  * WRAPPER-CACHE-NUMBER-VECTOR is identity macro -- deleted
  * commentary