rm 修复工具

examples:rmatest.rmcheckintegrityoftest.rmrma-ftest.rmtrytofixerrorsintest.rmwithdefaultsettingsrma-fb2n1test.rmtrytofixerrorsintest.rm,seektwopacketsbackwhenbrokenpacketisfound,onlyfixfirstbrokenpacketrma-sx1test.rmextractstream1fromtes