sbcl-0.8.16 release

sbcl-0.8.15 has been released.

from the NEWS file:
changes in sbcl-0.8.16 relative to sbcl-0.8.15:
  * enhancement: saving cores with foreign code loaded is now
    supported on x86/NetBSD and sparc/Linux in addition to the previously
    supported platforms.
  * bug fix: on some platforms repeated installations caused multiple
    copies of HTML documentation to be installed -- should not happen
    any more. (reported by Stefan Scholl)
  * bug fix: parsing self-recursive alien record types multiple times
    no longer causes infinite recursion. (reported by Thomas F. Burdick,
    original patch by Helmut Eller for CMUCL)
  * bug fix: stack-exhaustion detection works now on NetBSD as well.
    (thanks to Richard Kreuter)
  * bug fix: defining classes whose accessors are methods on existing
    generic functions in other (locked) packages no longer signals
    bogus package lock violations. (reported by François-René Rideau)
  * bug fix: special variables as DEFMETHOD parameters no longer have
    associated bogus type declarations. (reported by David Wragg and
    Bruno Haible)
  * bug fix: read-write consistency on streams of element-type
    (SIGNED-BYTE N) for N > 32.  (reported by Bruno Haible for CMUCL)
  * bug fix: redefiniton of the only method of a generic function with
    no DEFGENERIC no longer emits a full WARNING.  In addition,
    redefinition of generic functions with no DEFGENERIC to an
    incompatible lambda list now signals an error.  (thanks to Zach
    Beane)
  * bug fix: DEFGENERIC now works even when there's a function of the
    same name in an enclosing lexical environment.  (thanks to Zach