Interactive HistoryMatch axis end-point

The HistoryMatch scale end point is currently hard-coded to `10σ²`, as a reasonable default end-point (at `10σ²` the match is already poor).

However, there are use cases where you want to visualize misfits also larger than `10σ²`, at the same time as you can explore smaller more "reasonable" misfits.

Add zoom in/out functionality in plot wrt. horizontal axis?

Start by locating the HistoryMatch visualization and the code that hard-codes the horizontal scale endpoint at 10σ². Determine how horizontal-axis zooming should expose misfits above that endpoint while retaining access to smaller misfits; done means both ranges can be explored interactively.

Written by the indexing model from the issue text.