Order of intervals can break striplog

[kwinkunks]

The problem in the to_log() function, which is consistently getting the indices (start_ix, stop_ix, top_index, base_index) backwards in this dataset.

I think the problem is that we need to reverse indices when order is 'elevation'.

I think this affects to_log() and fill() at least.

See https://swung.slack.com/archives/C01FC2V9NVD/p1616330076013100

[mtb-za]

@kwinkunks this is resolved as of 527fe88, yes? Looking to see if I can close this issue.

[kwinkunks]

Let's say this is fixed.