Index generator for importer

[nnhjy]

Hi, if we want to import a list of values having no index from a csv/excel file as time-series data, adding indices to the list
on importing is quite inconvenient. Please see the attached project. Perhaps we should give the option to create indices in the importer interface.
BuildTimeseries.zip

[jkiviluo]

Could be something similar to the way regex is done in the exporter side.