Visualize bundle adjustment results (orientations, point density, point coverage) and make suggestions for re-processing

[bpurinton]

Original comment on: #93

The number of points in the bundle_adjust solution is relatively low. It might be useful to inspect the resulting adjustments and visualize to see if the resulting changes are realistic. WE could go back to using ip_per_tile, or use a mask to isolate points over exopsed ground (which is important for sites with vegetation). This one is a deeper issue, we can discuss more before action.

Not handling this on that PR as it is a bigger more general issue.