Ability to curate files with same header information.

Some components use the same header on multiple files.

For example, RocksDB uses the following header on over 100 files.
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).

Being able to group files by license header so that they might be curated in a single shot would provide substantial improvement in curation time.