It's not enough to check that the list is empty, we also need to check
that we have some data to begin with, i.e. we need to skip calling
`toFstDate` or `toLstDate` if we have a list of empty strings.

Test failed, not merging.

This reverts commit 2e77bfa5, reversing
changes made to fe201115.

This reverts commit a60a1be7.

Basically, Gargantext.Prelude exports all of Protolude now.

Based on the suggestions in
https://kodimensional.dev/space-leak

New similarity measure for inter-temporal matching added named WeightedLogSim Adapted from Wang, X., Cheng, Q., Lu, W., 2014. Analyzing evolution of research topics with NEViewer: a new method based on dynamic co-word networks. Scientometrics 101, 1253–1271. https://doi.org/10.1007/s11192-014-1347-y (log added in the formula + pair comparison)