feat: read cells-per-row option.

[icio]

Fixes #99

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[telpirion]

Hi @icio ! Thank you for this feature work. Would you please open an issue to correspond to this work? Thank you.

[icio]

@telpirion Done: #99. Referenced from the PR description.

[telpirion]

Thank you for your addition to the tool!

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[icio]

Worth retrying?

[icio]

@telpirion Merge conflict resolved so this might be good to go now.