Fix calculation of bar width
Fix calculation of bar width

Dividing the available space by the number of data points doesn't work for non-contiguous data sets like this one. Instead, we need to calculate the extent of the domain, and divide the available space by that value, which includes empty items (dates with no edits). And because we're now using moments, diffing the domain limits (to calculate its extent) is now trivial.

gpaumier/archaeo,gpaumier/archaeo