Nyall Dawson 9f43f2f608 [FEATURE][processing] New "Add values by expression" option for
populating batch processing dialog

This option adds news rows using the values from an expression
which returns an array. (As opposed to "Calculate by Expression",
which works only on existing rows).

The intended use case is to allow populating the batch dialog
using complex numeric series, e.g. those created by the "generate_series"
expression function.

For example, adding rows for a batch buffer using the expression

    generate_series(100, 1000, 50)

(results in new rows with values 100, 150, 200, .... 1000)
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