[Patch] Clean up and reformat to config/numeric and time

[Paolo Carlini]

Hi,

the second half of the patch is straightforward: it uses an union
(consistently with numeric) instead of reinterpret_cast in order to
avoid *a lot* of overlong lines.

The first hunk is slighlty less trivial, I would appreciate a look
over it. We had:

  union __s_and_w { const char *__s; unsigned int __w; } __u;
  __u.__s = __nl_langinfo_l(_NL_NUMERIC_DECIMAL_POINT_WC, __cloc);
  _M_data->_M_decimal_point = static_cast<wchar_t>(__u.__w);

I changed it to:

  union { char *__s; wchar_t __w; } __u;
  __u.__s = __nl_langinfo_l(_NL_NUMERIC_DECIMAL_POINT_WC, __cloc);
  _M_data->_M_decimal_point = __u.__w;

that is, basically, the union has directly wchar_t instead of the
(weird) intermediate unsigned int + final static_cast. The net
effect seems the same to me and the code slightly cleaner.

Tested x86-linux, would commit tomorrow.

Paolo.

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