HSSF, HSLF, HPSF, and HWPF support for writing out to a File, including an existing open file (#57919)
Various improvements to HSSF and XSSF.
XSSF performance improvements for large numbers of named ranges.
Progress towards enums rather than ints for various types
CellStyle#BORDER_HAIR and #BORDER_DOTTED were swapped to correctly reflect the official names and to be consistent with BorderStyle enum. HAIR has smaller dots than DOTTED.
Removal of deprecated classes and methods detailed on bug 59170