Allow non-numeric/date value into number/date formatted cell#206

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hnx8 wants to merge 3 commits intomk-j:masterfrom hnx8:master

+20-6

Commits on Jul 2, 2018

numeric format '#','?' accepts, '$' fixes.
hnx8
committed
to prevent excel file corruption, Set non-numeric data as a string cell instead of a numeric type cell.
hnx8
committed

Commits on Jul 3, 2018

to avoid cell value becoming '1900/01/01', Set non-date data as a string cell instead of a date type cell.
hnx8
committed