[physfs] Errors

[Ryan C. Gordon]

> When using Physfs I get too errors, after seeting up the write directory and
> usinging getLastError() I am told the archive is read only and then after
> setting up the search path I am told access is denied.

None of the archivers (.zip, .grp, etc) have write support at this point.
The write directory must be a real path that the user has permissions for
in the native file system.

--ryan.