"M" = Locally modified
"U" = Updated in repository
"A" = Locally added
"D" = Locally deleted
"I" = Ignored
"R" = Replaced in the repository
“–” "=" The contents of the folder have mixed status; display the contents to see individual status
"?" = Not under source control
'A' 新增
'D' 删除
'M' 修改
'R' 替代
'C' 冲突
'I' 忽略
'?' 未受控
'!' 丢失，一般是将受控文件直接删除导致
这些标记跟你使用的代码托管工具或者xcode自带的svn代码托管工具有关，怎样消除：