* tweak my docstrings
  * fix None returns to empty list
  * reshuffle responsibilities between '_find_exe()', '_find_SET()', and
    the MSVCCompiler constructor -- now the constructor worries about
    fetching the version list and determining the most recent one
  * added "/W3" compile option
Also, I added/tweaked some docstrings.

function names, dbetter (hopefully) ocstrings, and comments.

/export option mini-kludge.

  * don't need to mention python<ver>.lib -- it's done by a pragma
  * add debug flags for compile and link, and use them
  * fix 'link_shared_library()' to pass everything to 'link_shared_object()'
  * change filename when shared object with debug info (ugh)

to fallback to if the user doesn't set it for those commands.

  someone who knows Windows/MSVC++ to come along and add the right flags.
Comment noting that 'link_static_lib()' signature is inconsistent with
  the other compiler classes (uh-oh!)

'-g' flag to compiler/linker command lines when it's true.

Doc fix: several paragraphs under 'link_static_lib()' moved to
  'link_shared_lib()', where they belong.

_init_nt():  Use get_config_h_filename() instead of figuring out the
             name directly.

             g['SO'] should be set to '.pyd'.

             Adjust some minor coding nits.

harder to find the MSVC compiler (mainly by using the registry).

Typo fix.

in the current distribution: motivated by PIL's libImaging.

Announce when we start building each extension (better feedback).

feedback and, theoretically, the opportunity to set compiler flags
on a per-file basis.

Always use normalized (with os.path.normpath()) versions of prefix and
  exec_prefix.

  '--help-commands' option).
Shuffled imports around in a few command modules to avoid expensive
  up-front import of sysconfig (and resulting delays in generating list
  of all commands).

  * "--help" can now come either before or after particular commands
    to get help on and can give help on multiple commands, eg.
    "--help install dist" gives help on those two commands
  * added "--help-commands" option, implemented by the 'print_commands()'
    and 'print_command_list()' methods

Tweaked error messages in '_spawn_posix()'.

RT library.

Fixed 'make_release_tree()' to copy files if 'os.link()' doesn't exist.

command wasn't found or failed.  (Code supplied by Thomas Heller
<thomas.heller@ion-tof.com>.)

before storing or using.

the 'missing' parameter.

Added 'link_static_lib()' method, and 'archiver' and 'archiver_options'
  class attributes to support it.
Added 'link_executable()' method, and 'ld_exec' instance attribute
  to support it.
'newer_group()' is now able to handle missing files, so we don't have
  to kludge it by catching OSError when calling it.
'object_filenames()' and 'shared_object_filename()' now take 'keep_dir'
  flag parameters.
'library_filename()' and 'shared_library_filename()' now respect
  a directory component in the library name.
Various comment updates/deletions.

Added 'link_executable()' signature.