BuildTT: Builds a TideTable model
In TideTables: Tide Analysis and Prediction of Predominantly Semi-Diurnal Tides

Builds a TideTable model of class "tidetable".

BuildTT(
  dataInput,
  otz = 1,
  asdate,
  astime,
  aedate,
  aetime,
  hwi = "99:99",
  sharp_hwi = TRUE
)

`dataInput`	the data frame with observation date, observation time and height.
`otz`	time zone of the observations. Default is 1 (UTC + 1)
`asdate`	The start date.Format: "yyyy/mm/dd"
`astime`	The start time. Format: "hh:mm:ss"
`aedate`	The end date. Format: "yyyy/mm/dd"
`aetime`	The end time. Format: "hh:mm:ss"
`hwi`	The high water interval. Format: "hh::mm"
`sharp_hwi`	should the hwi computation be sharp? Default is TRUE

Returns a object of class "tidetable" which contains following elements:

`fitting.coeff`	Coefficients for the eight fitted linear models used in the synthesis
`diff.analyse`	Time in days spanning the analysis
`omega_t`	Return value of FindOmega()
`tm24`	Internal constant
`tplus`	Internal constant
`tmhwi`	Mean high water interval