[Distutils] Changes to config file handling

[Thomas Heller]

> Plus I fixed a bug nobody had reported:
>
>   * boolean options now work: previously, "force=0" resulted in an
>     attribute 'force' being set to the string "0", which of course
>     is true.  As an extra bonus, you can now use a variety of sensible
>     representations of true and false: yes, y, t, true, 1, on for true,
>     and no, n, f, false, 0, off for false.
>
Does not work with command line options.
Example:
  C:\sf\lpfw>setup.py build_ext -f
  running build_ext
  Traceback (innermost last):
    File "C:\sf\lpfw\setup.py", line 41, in ?
      ext_modules = [_ctypes, ExtensionClass, xxtype],
    File "c:\work\orion\src\Fpanel\Python\distutils\core.py", line 138, in
setup
      dist.run_commands()
    File "c:\work\orion\src\Fpanel\Python\distutils\dist.py", line 828, in
run_commands
      self.run_command(cmd)
    File "c:\work\orion\src\Fpanel\Python\distutils\dist.py", line 846, in
run_command
      cmd_obj = self.get_command_obj(command)
    File "c:\work\orion\src\Fpanel\Python\distutils\dist.py", line 726, in
get_command_obj
      self._set_command_options(cmd_obj, options)
    File "c:\work\orion\src\Fpanel\Python\distutils\dist.py", line 761, in
_set_command_options
      setattr(command_obj, option, strtobool(value))
    File "c:\work\orion\src\Fpanel\Python\distutils\util.py", line 284, in
strtobool
      val = string.lower(val)
  TypeError: read-only character buffer, int

string.lower(val) is called with the integer 1 (not the string "1").

Thomas