Main: Main
In eeholmes/VRAP: VRAP for RER and Viability Computations

Runs VRAP. This function is largely specific to the R version of VRAP.

Main(InFile = NULL, OutFileBase = NULL, NRuns = -1, NYears = -1,
  Title = -1, TargetStart = -1, TargetEnd = -1, TargetStep = -1,
  ERecovery = -1, QET = -1, ECrit = -1, NewRavFileName = "tmprav.rav",
  forceNewRav = NULL, silent = FALSE, lcores = 1,
  parallel.backend = "doParallel", save.output.as.files = TRUE)

`InFile`	The name of the .rav file
`OutFileBase`	The basename for the .sum, .byr, and .esc output files
`NRuns`	Number of runs to use in the simulations if the user wants to use something different than what is in the .rav file
`NYears`	Number of years to project forward in the simulations if the user wants to use something different than what is in the .rav file
`Title`	Title to use for the report if the user wants to use something different than what is in the .rav file
`TargetStart`	Target ER to start simulations at if the user wants to use something different than what is in the .rav file
`TargetEnd`	Target ER to end simulations at if the user wants to use something different than what is in the .rav file
`TargetStep`	Target ER step sizes if the user wants to use something different than what is in the .rav file
`ERecovery`	Recovery target if the user wants to use something different than what is in the .rav file
`QET`	if the user wants to use something different than what is in the .rav file
`ECrit`	if the user wants to use something different than what is in the .rav file
`NewRavFileName`	A new .rav file is saved in case the user has changed any values from what is in the .rav file.
`forceNewRav`	Force use of new rav file. Needed for shiny app.
`silent`	Whether to show progress bar.
`lcores`	Number of cores to use. Default is non-parallel so lcores=1
`parallel.backend`	doParallel or doSNOW. The latter allows the progress bar to appear.
`save.output.as.files`	If TRUE (default), then .sum, .byr, .esc and .rav files are saved using OutFileBase. If FALSE, no files are saved and only the list is output.