class Date with signed years, full (BCE,CE) proleptic Gregorian calendar

[Eike Rathke]

Hi,

https://gerrit.libreoffice.org/gitweb?p=core.git;a=commitdiff;h=6d4f2dcc7cbba771e9d9b00de50368db4a88ef1b

implements signed years with tools' class Date providing a full BCE,CE
proleptic Gregorian calendar.

Hopefully you shouldn't notice anything bad and I caught all relevant
places with that change. However, please be aware that

* year is now a signed sal_Int16 instead of unsigned sal_uInt16, the
  full int16 range can be used
* year 0 does not exist and the gap is skipped in calculations, last day
  BCE is -0001-12-31, first day CE is 0001-01-01
* do not use aDate.SetYear(aDate.GetYear()+number), use
  aDate.AddYears(number) instead
* years 1,5,9,... BCE (-1,-5,-9,...) are leap years

Further details in the commit message and include/tools/date.hxx

Happy dating :P

  Eike

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