Added new Load/Save overloads into C1.Win.C1FlexGrid.ImportExport assembly (TFS:319313):
void LoadGrid(this C1FlexGridBase grid, Stream stream, FileFormatEnum format, FileFlags flags, Encoding encoding),
void LoadGrid(this C1FlexGridBase grid, Stream stream, FileFormatEnum format, FileFlags flags),
void LoadExcel(this C1FlexGridBase grid, Stream stream, string sheetName, FileFlags flags),
string[] LoadExcelSheetNames(this C1FlexGridBase grid, Stream stream),
void SaveGrid(this C1FlexGridBase grid, Stream stream, FileFormatEnum format, FileFlags flags, Encoding encoding),
void SaveGrid(this C1FlexGridBase grid, Stream stream, FileFormatEnum format, FileFlags flags),
void SaveExcel(this C1FlexGridBase grid, Stream stream, string sheetName, FileFlags flags, PrinterSettings ps = null)