Zooming in/out should affect evolution lines by default

[jakemarotta]

As it stands, the isochrons and contours of the "Evolution Matrix" are static, and entire sets of data may not intersect with any lines (see UTh Example Data). When a user zooms in, more lines should become visible.

For example, if I zoomed in between isochrons with values 1000 and 2000, at a certain point, a line for 1500 should appear between them, so that the matrix is still useful.