BookData Comparisons should be able to base the Diff on the first version

At the moment, it is slightly counter-intuitive the way the diff-ing works for the most common scenario. That is,

ESV,KJV,ASV ends up comparing ESV with KJV and KJV with ASV. This model prevents us from comparing 1 version with multiple other versions.

Although KJV,ESV,ASV works for 3 versions, it wouldn't work for 4. Also, putting the primary version of interest in the middle is not very nice.

For four versions, all comparing to the first, we can't do this.

e.g. ESV,KJV,ASV,WEB current compares ESV with KJV, KJV with ASV and ASV with WEB.

There is no way to compare ESV with all other versions. What I would like is:

ESV w/ KJV, ESV w/ASV, ESV w/WEB