change -t option to be consistent with -a, -l, etc...

Currently, using the -t option has the side-effect of changeing the default filename and path, 
whereas the options -a, -l etc. do not.  The option '-n' can be used to provide the functionality to 
generate a filename from the name specified using '-t', therefore the extra functionality in the -t 
option seems redundant.

It would seem more logical to just have the '-t' perform just the 1 task 
of setting the title tag, and leave the '-o' or '-n' options to specify the output filename.