public void setPersistedDocumentUri(final PersistableUri persistedDocUi, final Uri uri) {
        persistedDocUi.setPersistedUri(uri);
        documentAccessor.releaseOutdatedUriPermissions();
    }
Sets a new User-defined Folder for a {@link PersistableFolder}.
main/src/main/java/cgeo/geocaching/storage/ContentStorage.java