Handling of worksheet functions from Excel 2010 and newer

[Winfried Donkers]

Hi Eike,

>To activate a test, in sc/qa/unit/subsequent_filters-test.cxx
>ScFiltersTest::testFunctionsExcel2010() in struct aTests simply change
>the corresponding row's bEvaluate member from false to true.

Thank you! :)
I have already included sc/qa/unit/subsequent_filters-test.cxx in my
checklist for coming Excel 2010 functions patches.

Next one will be Ceiling and Floor functions. 

Winfried