Test dataset for copick

A test dataset for copick. In order to use the filesystem-based models, adjust the overlay root path in sample_project/copick_config_filesystem.json after extraction.适用于copick的测试数据集。若需使用基于文件系统的模型，请在解压完成后，修改sample_project/copick_config_filesystem.json配置文件中的覆盖根路径（overlay root path）。