Add log2 support and make log10 obsolete for consistency.
* configure.ac (log2): Check for this function. * doc/lispref/numbers.texi (Math Functions): Remove obsolete function log10. * lisp/subr.el (log10): Move here from C code, and declare as obsolete. All uses of (log10 X) replaced with (log X 10). * src/floatfns.c (Flog) [HAVE_LOG2]: Use log2 if available and if the base is 2; this is more accurate. (Flog10): Move to Lisp (marked obsolete there).
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