Fix bad operator precedence: should be "(metadata or '') + '\n'".

The known bug (bogus error message when an empty file is
extracted) is fixed.

Other changes:

- The target-compile and target-optimize flags of bdist_wininst
  are gone. It is no longer possible to compile the python
  files during installation.
- The zlib module is no longer required or used by bdist_wininst.

- I moved the decompression/extraction code into a separate
  file (extract.c).

- The installer stub is now compressed by UPX (see
  http://upx.tsx.org/). This reduces the size of the exe
  (and thus the overhead of the final installer program)
  from 40 kB to 16 kB.

- The installer displays a more uptodate user wizard-like
  user interface, also containing a graphic: Just's Python Powered logo.
  (I could not convince myself to use one of the BeOpen logos).
- The installation progress bar now moves correctly.

don't assign None to any attributes of the Extension object.

in archive_util.py.

or ZIP file.

'--source-only' options.

hack to find the two created RPM files (source and binary) and
move them to the "dist dir" (default "dist").

represents packages as strings, not tuples.  This allowed a simplification
in 'get_package_dir()', too -- can now assume that 'package' is a string.

and is much better documented to boot.

argument list.

  * use self.debug_print() for debug messages
  * uses now copy.copy() to copy lists
  * added 'shared_lib_extension=".dll"', ... , this is necessary if you
    want use the compiler class outside of the standard distutils build
    process.
  * changed result type of check_config_h() from int to string

  * changed some list.extend([...]) to list.append(...)
  * added '/g0' to compiler_options, so compiler doesn't
    stop after 100 warnings

by the user.

participates in the "--root" hack, ie. it also has a new root directory
hacked on at the very last minute (essential if the .pth file is to be
included in an RPM or other smart installer!).

(allows the same FancyGetopt object to be used multiple times with different
option tables).

  wasn't actually used anywhere.
Drop the "from xxx_util import*" backwards compability hacks.

MSVCCompiler's version, to aid in factoring common code out of the two
classes when the time comes).

the --help-formats output.  Also moved that list up so it's more obvious
when adding formats.

the one in cmd.py).

consistency.

  - added big comment describing possible problems
  - look for and react to versions of gcc, ld, and dlltool; mainly
    this is done by the 'get_versions()' function and the CygwinCCompiler
    and Mingw32CCompiler constructors
  - move 'check_config_h()' to end of file and defer calling it until
    we need to (ie. in the CygwinCCompiler constructor)
  - lots of changes in 'link_shared_object()' -- mostly seems to be
    library and DLL stuff, but I don't follow it entirely

in '_init_nt()' (they were kludges for CygwinCCompiler and no longer needed).

it so BCPPCompiler actually works, so I'm provisionally accepting it
-- ugly and working is better than not working!  Major changes:
  - normalize paths (apparently BC++ doesn't like slashes)
  - overhauled how we search for and specify libraries on the linker
    command-line
  - hacked up 'find_library_file()' so it knows about "debug" library
    naming convention as well as "bcpp_xxx.lib" -- the question is,
    is this a well-established and sensible convention?
Also:
  - change to use 'util.write_file()' to write the .def file

'export_symbols' can be None (not sure this is a good idea: it's inconsistent
  with every other instance attribute of Extension).