说明：  用motorola的手机管理软件MPT导出的短信是一个个的txt文件，一个短信为一个文件，存储和阅读极为不方便。该程序稍加改动即可合并所有moto手机导出的短信
(Motorola mobile phone with MPT export management software is one of the messages of the txt file, a text message to a file, store and read very inconvenient. Modified the program to merge all moto mobile phone text messages derived)