timetablr: Representation and basic operation for multiple time series.

Adds prefix/suffix to the measurement/auxiliary (column) names of a time.table. This is useful for when you want to merge a transformed table back into the original one while avoiding clashing column names.

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affix_names(tt, prefix = NULL, suffix = NULL, measurement.prefix = NULL,
  measurement.suffix = NULL, auxiliary.prefix = NULL,
  auxiliary.suffix = NULL)

`tt`	time.table to transform names of
`prefix`	prefix to add to names (defaults to empty string)
`suffix`	suffix to add to names (defaults to empty string)
`measurement.prefix`	prefix to add to measurement names (defaults to `prefix`)
`measurement.suffix`	suffix to add to measurement names (defaults to `suffix`)
`auxiliary.prefix`	prefix to add to auxiliary names (defaults to `prefix`)
`auxiliary.suffix`	suffix to add to auxiliary names (defaults to `suffix`) Note, changes tt by reference (i.e. mutates it).