Case-sensitive names prevent untar on Mac OS X too

Note: I tried to add this as a comment to bug 414655 but repeatedly encountered errors when trying to post the comment.

Bug 414655 ("Can't unpack tar on Windows due to casing problem") also makes it impossible to untar the archive on Mac OS X which also uses a case-insensitive file system. It is obviously possible to extract the skipped files into a separate directory but since PyRoom and pyroom cannot coexist in the same directory, this then requires renaming one of them and amending all of the code appropriately.

So a Windows-specific work around such as that discussed in the discussion of that bug will likely not work well for everyone getting bitten by this.

It would be a shame if OS X also then required a special work around since there should otherwise be at least a fighting chance of the code working more-or-less out of the box.

Note on OS X file system: Although it is possible to run OS X on a case-sensitive file system, this is not the default and is not the recommended choice (it can cause various problems). I don't know of anybody using OS X using a case-sensitive file system so although I certainly wouldn't claim nobody does so, I am betting it is a tiny minority. The actual case-sensitivity is peculiar and sometimes the file system behaves case-insensitively and sometimes case-sensitively. For reasons presumably best known to Apple, the peculiar behaviour is, unfortunately, default and standard. Anyway, two files whose names differ only in case cannot coexist on the same system.