Fix POI Bug 52369

XSSFExcelExtractor should format numeric cells based on the format
strings applied to them(poi-developers)
fix LF formatting issue

done automatically by Github
Fix POI bug 51780

convert all the test cases of OPC to NUnit and make every test pass
commit changes for poi bugs
add readme file
Update README.md
Update README.md
fixed poi bug 51670:  avoid LeftoverDataException when reading .xls files with invalid LabelRecord
Fix poi bug #51832 - handle XLS files where the WRITEPROTECT record preceeds the FILEPASS one, rather than following as normal
poi Bug 52895 - show SSTIndex instead of XFIndex in LabelSSTRecord.toString()
Add a method to HSSFFont to get the color, similar to the XSSF one
XLS: HyperlinkRecord: remove check for value in usKeyValue field because some (correct) files has unexpected value there
poi bug 52527 - avoid exception when matching shared formula records in HSSF(poi-developers)
fix pot Bug 52576: support changing external file references in HSSFWorkbook
fix poi Bug 52626: fixed setting default row height in HSSF and XSSF
fix Bug 52574 - support setting header / footer page margins in HSSF. Test case passed
sync bug 49529 - avoid exception when cloning sheets with no drawing records and initialized drawing patriarch. but test case failed.
sync Bug 53204: Improve performance when opening certain Excel files (PageSettingsBlock)
sync test case of Bug 53414: properly update sheet dimensions when adding column
sync Bug 53500 - Getter for repeating rows and columns
sync Bug 53500: split setRepatingRowsAndColumns into setRepeatingRows and setRepeatingColumns
Add support for CopySheet to HSSFSheet.cs
Allows Color Palettes, styles, and images to be copied along with the sheet
- Fix a bug with CopySheet() that I fixed in CopyTo() that causes corrupt cell text.
- Updated comment for a method to properly reflect its current purpose.
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