diff.time.table: Difference time.table
In rossklin/timetablr: Representation and basic operation for multiple time series.

Difference (diff) each time series in a time.table, taking missing missing values into account (i.e. each difference it taken at exactly one time step, with a value of NA if the next observation is not present). Optionally diff preserves the exact index/time combinations present in the original time.table (in which case some information is lost).

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## S3 method for class 'time.table'
diff(tt, forward = TRUE, preserve.frequency = TRUE,
  ...)

`tt`	time.table to difference
`forward`	compute forward differences (default).
`preserve.frequency`	preserve the range of (indeed, exact) values present in `tt`
`...`	unused Note that for now only forward==TRUE and preserve.frequency==TRUE are implemented.