MoveR release v0.3.0

• Make ‘identity’ the default value for the [by] argument in the
  convert2Tracklets() function.
• Make ‘frame’ the default value for the [timeCol] argument in the
  ANND(), resampTracklets(), sinuosity(), speed(),
  temporalBoot(), temporalTrend(), turnAngle() functions.
• speed() function now accept [frameR] (frame rate) and [timeU]
  (time unit) arguments allowing to return speed values according to the
  desired unit (e.g., pixels per frame, pixels per second).
• Make “1” the default value for the [sampling] argument in the
  ANND() function.
• Change the default value of the [flipY] argument in the
  readIdTracker() functions from TRUE to FALSE as for other “read”
  functions
• Add “AnimalTA” to an error message returned by the DLsampleData()
  function when the [tracker] argument is misspelled.
• Add the possibility of retrieving the path to several tracking outputs
  at the same time using DLsampleData().
• Solve an error when both [selTrack] and [timeWin] arguments were
  specified in drawTracklet() with several time windows, drawing only
  the specified tracklets on the first time window.
• Processing time of drawTracklet() has also been speed up.
• The “read” functions aiming to import tracking data from various
  tracking software now return an object of class (S3) “tracklets”,
  corresponding to a list of tracklets, meaning that converting the
  output of “read” functions to a list of tracklets (using
  convert2Tracklets()) before further processing is no longer needed.
• Add setInfo() and getInfo() functions to the utilities to specify
  and retrieve useful information such as frame rate (frameR), scale
  (scale) and image resolution (imgRes) to the tracklets object,
  allowing to avoid unnecessary repetition of code over several
  functions.
• Add the possibility to subset “varList” and “tracklets” objects using
  [], also allow to use as.data.frame() on varList object to convert
  it to a data frame.
• convert2List() now returns an object of class “varList” which is
  still a list of variables and conserve the additional information
  appended to the converted tracklets object, meaning that additional
  information are conserved over conversion from tracklets to varList
  and back to tracklets.
• trackstats() is now deprecated (but still can be used) and is
  replaced by summary() according to the use of S3 methods for
  tracklets class objects when importing tracking data.
• Add the possibility to compute the distance between particles
  trajectory and a polygon edges using dist2Edge() by setting
  customFunc = “PolygonArena”.
• cutTracklets() and sortVertices() functions are now considered as
  an internal function and cannot be used anymore (prefer using
  filterTracklets).
• Reduce code redundancy by creating an internal function to return
  error messages .errorCheck.