ENH: add flag --high-pass-filter for custom filtering cutoff

[zkhan12]

Changes proposed in this pull request

ref #1961

Documentation that should be reviewed

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[effigies]

Hi! Not sure how this got completely ignored for 1.5 years... There are a number of conflicts with master now, if you'd like to merge/rebase.

[effigies]

Please rebase and reopen if this is still of interest. Apologies again for letting this slide without response for so long.