Inline and Crossline displays (3D)

[EvanBianco]

Coupled inline and crossline display for 3D seismic. Need to integrate with annotation from #24

[EvanBianco]

Sort / reshape traces into 3D array:

• Need to build a np.meshgridlike array for a 3D data volume holding the x_coordinate, y_coordinate, inline number, and crossline number for each trace.
• Add configuration parameters to YAML for choosing inlines and xlines to display (maybe choose "middles" if no parameters are specificied.
• Refactor Matplotlib Figure window to take two seismic axes.
• Link displays using annotation to each other (vertical lines for intersections), and (later) to basemap (issue Shotpoint basemap #24)

[kwinkunks]

This is basically working. With caveats like #34