Y-limits on analysis screen plots

[petertuuk]

On the analysis screen the y-limits of the plot are set according to the whole workout. If a workout includes a portion that is very slow (very high minutes per mile), like a recovery, the y-limits of the pace plot become very large and the plot is unreadable.

These wide y-limits are retained even when looking at only a part of the workout (by adjusting the x-limits) that doesn't contain the slow portion.

Potential solutions include:

1. (Most preferable) User-adjustable y-limits, or
2. Auto adjustment of the y-limits to match the y-bounds of the content after adjusting the x-limits