file size header field.

Thanks to Marc Abramowitz and Ronan Lamy for helping out with various
parts of the patch.

  Regenerate aclocalm4 and configure.

  Regenerate aclocalm4 and configure.

  from GCC for native builds

OSError.__init__ could produce incomplete instances, leading to crashes
when calling str() on them.

  for host compiler.

  Add NEWS entry, rename _PROJECT_BASE to _PYTHON_PROJECT_BASE.

None of the _mpd_shortadd() or _mpd_shortmul() functions read uninitialized
values. Previously zeroing was required since _mpd_real_size() was called
on the output array.

  for host compiler.

   require values set in CONFIG_SITE.

set cross_compiling = False for now.

use log10() to calculate the size of the output array. The current code
has been tested on x86/amd64 (and to a lesser extent on qemu-mips qemu-sparc)
and produces sufficiently large values for all inputs tested so far (coefficient
sizes of 10**18 - 1 are hard to test exhaustively).

The new code does not rely on the correctness of log10() and resizes
the output arrays if the allocated space is insufficient.

Patch by Marc Abramowitz.