add impact.select reset_frequency option

[timschmi95]

Changes proposed in this PR:

• add a reset_frequency option in impact.select(), analogue to hazard.select()

This PR fixes #830

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[timschmi95]

@emanuel-schmid All tests are failing due to missing internet connection. Is this a temporary issue or do I need to change something?

[peanutfun]

@timschmi95 An issue with the data API firewall. Will probably take until next week to be resolved

[emanuel-schmid]

may still fail due to a problem with the installation environment but at least the firewall issue is solved

[peanutfun]

Thanks a lot for this nice contribution! 🙌 I have a few minor suggestions.

[peanutfun]

Excellent work, @timschmi95 🎉