calc: xlsx import time wins - uppercase is 8% of import

[mmeeks]

Long running demo profile for the last week shows this:

Also transliteration stuff in:

That looks un-necessary; I would expect a precise string match, corrected by the spreadsheet at formula input time, and that would be the default - perhaps we should fallback to something more clever but - an exact match would be what we expect I guess.

@grandinj perhaps some low hanging fruit there =)