Refactoring Calc core

[Kohei Yoshida]

Hi there,

Just FYI, I'm currently working on refactoring Calc core on master, 
mainly to prepare for the future cell storage switch which I'd like to 
see happen sometime soon.

For now, my focus is to

1. remove data members from ScBaseCell, which has already been completed 
partially, and

2. remove direct use of ScBaseCell and its derivatives outside the scope 
of ScDocument, but the use of ScFormulaCell is permitted for now.

Thanks,

Kohei

-- 
Kohei Yoshida, LibreOffice hacker, Calc