Save the PDF document describing the DAS format required by swfscDAS to a specified file
Arguments
- file
- character, the name of the file where the PDF will be saved 
- ...
- passed on to - file.copy; might included named argument- overwrite
Value
output of file.copy;
  TRUE if writing of file was successful, and FALSE otherwise
Details
A wrapper function for file.copy.
  This function saves the PDF document describing the DAS data format requirements by
  copying the PDF document located at system.file("DAS_Format.pdf", package = "swfscDAS")
  to file
This file can also be downloaded from https://github.com/swfsc/swfscDAS/blob/master/inst/DAS_Format.pdf