CRAN release v6.5.0

IMPROVEMENTS

• It's now possible to have a 'tspan' vector of length one to simulate
  over one time-unit only i.e. [t, t+1).

• The trajectory function has been ported to C and parallelized to
  efficiently transform simulated data from a model to a data.frame.

• Static code analysis of the codebase has been performed using the
  lintr package in order to improve code style, consistency and
  readability.

• It's now possible to specify what type of plot should be drawn from
  the simulated data, see the documentation.

• Better documentation of the SISe, SISe3, SISe_sp, and SISe3_sp
  models.

CHANGES

• The way to specify the number of threads to use in parallelized
  functions has been changed to fix that specifying the number of
  threads should only affect SimInf and not other packages using
  OpenMP. Use set_num_threads to specify the number of threads, see
  documentation. It still works to pass the number of threads to the
  run() function, however, the threads argument will be removed
  from run() in a future release.

• Updated the vignette to use the 'set_num_threads' function.

• To avoid cluttering the error message, the name of the internal
  function that generated the error has been removed from the error
  message (use traceback to print the call stack of the last
  uncaught error). Additionally, all error messages now ends with a
  . (full stop).

• Removed the row and column names from the internal matrices U and V
  because they were not used anywhere in the code.

BUG FIXES

• Fix storing solution of the state vectors of the first time point
  until after simulated time has passed the the first time point in
  tspan.