Transform a subset of fred_qd to use directly about bvar HOT 5 CLOSED

So I worked on adding that. @oDNAudio, can you maybe review dl_fred_qd.R whether it works correctly?
Also how should we name the transformed data - just fred_qd_trans?

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Reviewed it, cross-checked a few series and seems to work fine in general.
Changed the way second differences are calculated though.
Also multiplied the series which are transformed via differences by 100, to make it easier to interpret for the user.

About the naming, I think fred_qd_trans is fine, no need for a fancier name I guess.

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Danke, sieht deutlich besser aus 💯.
The database is detrended already, right? Cause in the examples we compare the quarters (every 4th) - I skimmed the paper again and maybe that's not necessary?

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Yes, I think so. In the paper we compute yoy-change rates for some variables, I think the main idea was to enhance interpretability. However, it's not really necessary, that's true.

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Looking good!

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