- file_util.py: operations on single files
  - dir_util.py: operations on whole directories or directory trees
  - dep_util.py: simple timestamp-based dependency analysis
  - archive_util.py: creation of archive (tar, zip, ...) files
The functions left in util.py are miscellany that don't fit in any of the
new files.

the Command class from core.py to cmd.py.  No other code needs changing
though; distutils.core still provides the Command and Distribution classes,
although indirectly now.

functions, but with different names.

HKEY_* and Reg* names once, rather than having near-duplicate code
in the two import attempts.

Also dropped the leading underscore on all the imported symbols,
as it's not appropriate (they're not local to this module).

option to disable this (by default, it's false and we clean up).

we still have to *run* the sub-command that creates a built distribution.

multiple built distributions in one run -- it seemed a bit dodgy and I'd
rather remove it than try to beat it into submission right now.

Added 'ztar', 'tar' to 'format_command' dictionary.

eg. sunos5, linux2, irix5.

now done in the 'build_ext' command.

  * build to "Debug" or "Release" temp directory
  * put linker turds (.lib and .exp files) in the build temp directory
  * tack on "_d" to extensions built with debugging
  * added 'get_ext_libname()' help in putting linker turds to temp dir
Also, moved the code that simplifies None to empty list for a bunch
  of options to 'finalize_options()' instead of 'run()'.

specific to building Python extensions.

Simplified 'Command.get_peer_option()' a tad -- just call 'find_peer()'
  to get the peer command object.
Updated 'Command.copy_file()' to take a 'link' parameter, just like
  'util.copy_file()' does now.
Added 'Command.make_archive()' to wrap 'util.make_archive()'.

Changes to 'copy_file()':
  * added support for making hard links and symlinks
  * noted that it silently clobbers existing files when copying, but
    blows up if destination exists when linking -- hmmm...
  * error message tweak
Added 'base_name' parameter to 'make_tarball()' and 'make_zipfile()'.
Added 'make_archive()' -- wrapper around 'make_tarball()' or
  'make_zipfile()' to take care of the archive "root directory".

the command that actually creates "dumb" binary distributions, ie.
tarballs and zip files that you just unpack under <prefix> or <exec-prefix>.
Very limited, but it's a start.

Initial revision is pretty limited; it only knows how to generate "dumb"
binary distributions, i.e. a tarball on Unix and a zip file on Windows.
Also, due to limitations in the installation code, it only knows how to
distribute Python library code.  But hey, it's a start.

Added 'get_inputs()' (which is strikingly similar to 'get_outputs()' - sigh).
Cosmetic tweaks.

  provided by Distribution.
Cosmetic and error message tweaks.
Simplified 'make_release_tree()':
  * extracted 'distutils.util.create_tree()'
  * don't have to do hard-linking ourselves -- it's now handled by
    'distutils.util.copy_file()' (although the detection of
    whether hard linking is available still needs to be factored out)
Removed 'make_tarball()' and 'make_zipfile()' entirely -- their role
  is now amply filled by 'distutils.util.make_archive()'.
Simplified 'make_distribution()':
  * use Distribution's new 'get_full_name()' method
  * use 'make_archive()' instead of if/elif/.../else on the archive format

use global __debug__ flag to determine if compiled files will be ".pyc"
or ".pyo".  Tweaked compilation output messages too.

might have been copied, regardless of the 'update' flag.

Made handling OSError in 'mkpath()' more standard.

make 'mkdir()' return list of directories created.

for the 'bdist_dumb' command.  Adapted, with tweakage, from the 'sdist'
command.

in preparation for the 'bdist_dumb' command; these methods remain as
trivial wrappers around the versions in distutils.util.

'has_ext_modules()', 'has_c_libraries()', 'has_modules()', and 'is_pure()'.

  is responsible for installing all Python modules (pure and extensions).
Added 'get_outputs()' in preparation for the 'bdist' command, and
  '_mutate_outputs()' to support 'get_outputs()'.

  in a class attribute 'sub_commands', rather than hard-coded in 'run()'.
  This should make it easier to subclass 'install', and also makes it
  easier to keep 'run()' and the new 'get_outputs()' consistent.
Added 'get_outputs()' in preparation for the 'bdist' command.

methods of Distribution instead of grovelling directly in self.distribution.

Changed signature of 'build_extensions()': no longer takes the extension
  list, but uses 'self.extensions' (just like 'get_outputs()' has to)
Moved call to 'check_extensions_list()' from 'run()' to 'build_extensions()',
  again for consistency with 'get_outputs()'.

A host of improvements in preparation for the 'bdist' command:
  - added 'get_outputs()' method (all the other improvements were to support
    this addition)
  - made 'find_package_modules()' and 'find_modules()' return similar
    values (list of (package, module, module_filename) tuples)
  - factored 'find_all_modules()' out of 'get_source_files()' (needed
    by 'get_outputs()')
  - factored 'get_module_outfile()' out of 'build_module()' (also needed
    by 'get_outputs()')
  - various little tweaks, improvements, comment/doc updates