Don't show the final iteration, if incomplete, in certain training stats and similar

[dmh23]

An incomplete iteration can produce a large spike or dip at the end of a graph depending on how uneven performance is across various starting points - note for example that the AWS Console only adds results for completed iterations (although it does add incomplete evaluation results - which can be a bit spikey)

The biggest issue (for me) is that this can mean the graph scale is reduced because a lot of vertical space is given to the spike.

[dmh23]

Added simple filter to not display the final iteration - and default is off (not showing it) to give best possible experience up front