SignalDoc.csv standardization

SignalDoc.csv is critical for understanding reproducibility, and thus this entire repo. But like all human endeavors, Signaldoc.csv has room for improvement. We want to track these improvements carefully, by standardizing SignalDoc.csv as follows:

1. Sort based on Signal Rep Quality and then on Acronym
2. Use double quotes following the Excel conventions.
   1. This means only using double quotes when necessary, like when there's a comma in the cell (in an author list).

I honestly don't love favoring Excel for anything at all, so we may update this standard in the future.