
The three new functions: ```cpp void cvStartWriteRawData_Base64(::CvFileStorage * fs, const char* name, int len, const char* dt); void cvWriteRawData_Base64(::CvFileStorage * fs, const void* _data, int len); void cvEndWriteRawData_Base64(::CvFileStorage * fs); ``` Test is also updated. (And it's remarkable that there is a bug in `cvWriteReadData`.)