[cmucl-imp] Snapshot 2014-12

[Raymond Toy]

Another month, another snapshot.  Some of the key changes for this
month:

 * Executables on x86 work again. They were accidentally broken when
   we removed support for x86.
 * PPC now supports executables. Currently executables can be made,
   and run, but they are rather buggy.
 * Many fixes the the LOG function, including more accurate log2 and
   log10 values.
   * (log (expt 2 n) 2) = n whenever (expt 2 n) would be a valid
     double-float number.
   * (log (expt 10 n) 10) = n whenever (expt 10 n) would be a valid
     double-float number.
 * New macros: LISP:WITH-STRING-CODEPOINT-ITERATOR and
   LISP:WITH-STRING-GLYPH-ITERATOR that work similarly to
   WITH-HASH-TABLE-ITERATOR.
 * Along with the iterators above, LOOP includes extensions like
   * (loop for cp being the codepoint of string ...)
   * (loop for g-string being the glyph of string ...)

Ray