Define message values. Remove unnecessary timeout.
Remove unused import.
REname method
new feature
method renames
remove commented out test code
Failing test for - If history file exists then do not copy to other
destinations
keep track of whether each source file has yet been copied. First test
passing. Need to add tracking of date of each source file.
If history file exists then do not copy to other destinations - more
accurately, do not copy a file if it has been already copied - working
Remove redundant code and tests
Added persistence for the set of copied files.