Resolve the Archive.path attribute, e.g. set it to the absolute path of the archive.
Fix many tests that were still passing a string as path argument to Archive.create() and Archive.open(), despite the fact that this is not supported since 0.3, ref. #36.
Archive.pathattribute, e.g. set it to the absolute path of the archive.pathargument toArchive.create()andArchive.open(), despite the fact that this is not supported since 0.3, ref. #36.