Kifield

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* File backup now works on all files in a hierarchical schematic.

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* Fixed mishandling of quoted strings containing escaped quotation marks.

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* Catch exception caused by numeric fields that aren't strings interacting with vis/invis option.

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* Added visibility/invisibility option for fields.

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* Added "grouping" option (`--group`) for gathering components with the same field values onto a single line of the XLSX/CSV/TSV file.

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* Added recursive operations on hierarchical schematics so everything can be handled just by processing the top-level file.