CSV import improvements, refs #10579
CSV import improvements, refs #10579

A couple of minor CSV import improvements:

  * Make keymap fetching method static

    Make fetchKeymapEntryBySourceAndTargetName function static for use
    externally (within a transformation script, for example, to check whether a
    parent has been imported or skipped).

  * Add method to copy column values

    Added a method to the CSV import class to copy one column value to another
    column.

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