#167 Avoid chaining plot links

Having the plots views linked through an intermediary on both the x and y axis seems to be the culprit for not being autoscaled properly during initial loading. This behavior disappears already even if one of the links is moved from intermediary to direct connection. Removed both intermediary usages since it makes things easier to follow and removes a chained propagation of events.

This fix does not resolve the behavior I described in the issue comment related to the plot resize inconsistencies that happen when playing with the app window size - tho that also seems to be connected to the linking behavior (when the 3 plots are unlinked, they resize properly together with the window). I would suggest behavior that window-resize issue for now since it is a low occurrence event that has barely any ramifications.