Simplify tests

Don't use '--' in tests

Fix nocache short-read tail initialization and add regression test

Add `-o maxfilters` option

Add and use ScopedFile

Remove an incorrect debug assertion

Work around libarchive issue 2513 only if necessary

Handle filtered ZIPs

Support more formats than just TAR after a filter

Update tests

Fix tests when libarchive does not have zlib support

Remove filename extension with `-o nomerge`

Some 7z tests require lzma

Add tests

Automatically trim the top of each archive's tree