Preprocess history file for EDR

Locate history file based on path and prefix, copy to specified output directory, and rename to correct time.

EDR.preprocess.history(history.path, output.path, datetime,
  history.prefix = "history")

Arguments

history.path	Path to directory containing history file.
datetime	POSIX date and time for run
history.prefix	String describing the history file prefix in history.path. Default = 'history'