First approach of tree view (doesn't work perfectly).

Kai Reinhard

18.31.2018 caf233c0080057c51e2eaad02f8118853ddd205b

 borgbutler-core/src/main/java/de/micromata/borgbutler/cache/ArchiveFilelistCache.java

@@ -129,7 +129,10 @@
            log.error("Error while reading file list '" + file.getAbsolutePath() + "': " + ex.getMessage(), ex);
        }
        log.info("Loading done.");
        return filter.reduce(list);
        if (filter != null) {
            return filter.reduce(list);
        }
        return list;
    }

    /**