#17 Log to File function

[codebert]

Great program... one enhancement request related to
logging.

It would be nice to tell the program to log to a file
instead of to the screen (or perhaps do both).

Reasons: 1) When synchronising many files (10's of
thousands upwards) the GUI starts slowing down quite
dramatically because of all the info being written to
screen and having to refresh. The log to file option
would prevent this.

2) Logging to file would allow one to keep records of
previous sync operations. The log could be set to
overwrite with each sync, or overwrite if older than 30
days, or if greater than N Megs, or create new log with
each sync operation, etc.