Problem:    Can't build with Python and MSVC10.
Solution:   Move #if outside of macro. (Taro Muraoka)

Problem:    "make test" on MS-Windows does not report failure like Unix does.
Solution:   Make it work like on Unix. (Taro Muraoka)

Problem:    Loading Python modules is not tested.
Solution:   Enable commented-out tests, add missing files. (ZyX)

Problem:    Unused variables in Perl interface.
Solution:   Adjust #ifdefs.

Problem:    Can't build Ruby interface with Ruby 1.9.3.
Solution:   Add missing functions. (V. Ondruch)

Problem:    Having auto/config.mk in the repository causes problems.
Solution:   Remove auto/config.mk from the distribution.  In the toplevel
            Makefile copy it from the "dist" file.

Problem:    Changing 'fileformat' and then using ":w" in an empty file sets
            the 'modified' option.
Solution:   In unchanged() don't ignore 'ff' for an empty file.

Problem:    has("win64") does not return 1 on 64 bit MS-Windows version.
Solution:   Also check for _WIN64 besides WIN64.