0.8.13.47:

0.8.13.47:
	The quest for a real 64-bit port continues:

	* add logic for 64-bit friendly specialized array types (although
	  the appropriate getter and setter VOPs may not be written);
	* add widetags for the same and attempt to preserve binary
	  compatibility by not moving around the widetags for existing
	  32-bit ports;
	* modify bits of the garbage collector to handle the same, mostly
	  in scavenging and friends.  The garbage collector has not been
	  reviewed (yet) for 64-bit cleanness;
	* export symbols for 64-bit friendly specialized array types
	  from appropriate packages (but note KLUDGE in package-data-list);
	* export several Lisp-determined constants in SB!VM to C-land.
	  Since they are no longer hard-coded in the C source files,
	  rearrange headers to #include sbcl.h as the first user-defined
	  header to ensure constants are recognized in other header files;
	* remove 32-bit assumptions from NWORDS in the garbage collector
	  and remove duplicate definitions from various places.