Added great flexibility to the code that creates the log file. It is property
driven at present, and the default behavior is the same as the old default
behavior, except that a message is printed to standard output telling the
user which log file is being used, and that they should include its contents
in bug reports.
You can log to the temporary directory, a directory of your choice, or (by
default) the current directory. Edward's related feature request can now
quickly be fulfilled.
