Use PS-tag to check compounds

[fellen31]

Description

Closes #192. Closes #196.

Changed

• Changed to use PS-tag instead of intervals to check for variants in phase with genmod models --phased, since this is simpler and more reliable
• Refactored the implementation of check_compounds() to improve maintainability

Fixed

• KeyError when running genmod models --phased with multiple individuals (#197)

How to prepare for test

• Ssh to relevant server (depending on type of change)
• Use stage: us
• Paxa the environment: paxa
• Install on stage (example for Hasta):

  bash /home/proj/production/servers/resources/hasta.scilifelab.se/update-tool-stage.sh -e S_[TOOL]-t [TOOL] -b [THIS-BRANCH-NAME] -a

How to test

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Expected test outcome

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Review

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This version is a

• MAJOR - when you make incompatible API changes
• MINOR - when you add functionality in a backwards compatible manner
• PATCH - when you make backwards compatible bug fixes or documentation/instructions

Implementation Plan

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