Should handle multiple events in e_data occurring at the same date_time

[ThomUK]

Currently 1 second between events is processed correctly, but a duplicate date_time causes an error.

Linked to #159. Possibly even duplicate issue.

[francisbarton]

I've added a pretty heavy-handed workaround for this in the issue_110 branch. I'm sure there's a more elegant or more appropriate way to do it. So haven't made a pull request.

Edit: I think my arrange() -> distinct() process here is better handled by slice_max().

Edit 2: This is not heavy really, it's pretty simple - but it is still a brute force way to handle the problem!

[ThomUK]

Human Input Needed

This issue may be a duplicate of #159, which includes a full reprex. Additionally, the current code in make_spc_data() already contains a slice_max deduplication step that may already resolve this case.

Please confirm:

1. Is this a duplicate of Plotthedots generates an error if multiple events are submitted on a single day #159, and should it be closed as such?
2. If distinct, what is the specific scenario that Should handle multiple events in e_data occurring at the same date_time #149 covers that Plotthedots generates an error if multiple events are submitted on a single day #159 does not?