Added DistutilsPlatformError.

'chmod()' in 'copy_file()'.

'install_site_lib' and install_site_platlib' on non-POSIX platforms.
Should at least work for NT, as this is adopted from Amos Latteier's NT
patches.  Also added extensive comments bitching about the inadequacy of
the current model, both under POSIX and NT (and probably other) systems.

  'run_command()' to refer to it before attempting to run a command --
  that way, command classes can freely invoke other commands without fear
  of duplicate execution.
Beefed up some comments and docstrings.

Amos Latteier <amos@aracnet.com>).

meaningful return values: respectively, whether the copy was done, and
the list of files that were copied.  This meant some trivial changes in
core.py as well: the Command methods that mirror 'copy_file()' and
'copy_tree()' have to pass on their return values.

of the 'install_py' command rather than 'build_py'.  Obviously, this
meant that the 'build_py' and 'install_py' modules had to change; less
obviously, so did 'install' and 'build', since these higher-level
commands must make options available to control the lower-level
commands, and some compilation-related options had to migrate with the
code.

and dry-run flags consistently painless): 'execute()', 'mkpath()',
'copy_file()', 'copy_tree()', 'make_file()', and stub for 'make_files()'
(not sure yet if it's useful).

  that wrap them in the Command class).
Fixed 'copy_file()' to use '_copy_file_contents()', not 'copyfile()'
  from shutil module -- no reference to shutil anymore.
Added "not copying" announcement in 'copy_file()'.
Wee comment fix.

and 'make_file()'-- that way, the verbose and dry-run flags are
handled for free.

works on non-seekable file-like objects, such as URLs.  (Oops.)

ProcessHierarchy's changes to support reading from a remote URL in
ProcessDatabase).

a much less formalistic way.  Just keeping this around for possible
future reference.

files with (optional) comment stripping, blank line skipping, whitespace
removal, and line joining with trailing backslashes.

	installations; it was picking up a stale config.h from an
	overwritten installation.

get_config_h_filename, get_makefile_filename, parse_config_h, and
parse_makefile.