changes in sbcl-1.0.52 relative to sbcl-1.0.51:

  * enhancement: ASDF has been updated to version 2.017.
  * enhancement: the --core command line option now accepts binaries with
    an embedded core.
  * enhancement: when built with :sb-core-compression, core files (regular
    or executable) can be compressed with zlib.  Use the :COMPRESSION
    argument to SAVE-LISP-AND-DIE to specify a compression level.
  * enhancement: --[no-]merge-core-pages determines whether the runtime
    hints the operating system that identical core pages between SBCL
    processes should share the same physical memory.  Default is to only
    enable this for compressed cores.
  * optimization: SLEEP no longer conses.
  * optimization: *PRINT-PRETTY* no longer slows down printing of strings
    or bit-vectors when using the standard pretty-print dispatch table.
  * bug fix: non-function FTYPE declarations no longer cause a compiler-error.
    (lp#738464)
  * bug fix: compiler-errors causes by MEMBER types in conjunction with with
    AREF, CHAR, etc. (lp#826971)
  * bug fix: compiler-errors causes by integer arguments with composed of
    multiple ranges to ARRAY-IN-BOUNDS-P. (lp#826970)
  * bug fix: ,@ and ,. now signal a read-time error for certain non-list
    expressions. (lp#770184)
  * bug fix: complex single float literals are correctly aligned when used
    as arguments of arithmetic operators.
  * bug fix: on 32-bit platforms, rounding of double floats larger than a
    fixnum is correct.  (reported by Peter Keller)
  * bug fix: stray FD-HANDLERs are no longer left lying around after unwinds
    from RUN-PROGRAM.  (lp#840190, reported by Dominic Pearson; fix from Max
    Mikhanosha)
  * bug fix: redefining classes such that slots with custom allocation are
    added or removed works again.