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Add python class to parse line files

Rodrigo Tenorio requested to merge rodrigo.tenorio/lalsuite:add-line-file-parser into master

Description

Line files collect information about narrow-band instrumental artifacts (aka lines) affecting CW searches. Due to practical reasons, these files list instrumental artifacts in a compressed way (e.g. harmonics of a line are compressed into a single entry with the specified harmonics in a column).

From the point of view of CW searches, it is more useful to unfold lines into [f0_min, f0_max] frequency intervals, which can be easily compared to the frequency evolution of a candidate in order to discard it or not.

This PR adds a python class to do so.

Summary of changes:

  • Class to read and expand line files into [left_wing, f0, right_wing] or [f0_left, f0_right] formats.
  • Test cases using two manually generated line files.

Comments and suggestions are welcome.

cc @evan-goetz as line expert cc @karl-wette @david-keitel as maintainers

API Changes and Justification

Backwards Compatible Changes

  • This change introduces no API changes
  • This change adds new API calls

Backwards Incompatible Changes

  • This change modifies an existing API
  • This change removes an existing API

Review Status

This code was reviewed during the Early O3 all-sky binary search review.

Edited by David Keitel

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