[Bug-ddrescue] forcing logfile usage, and speed

[Darxus]

Feature request:  Force logfile usage.
Please make ddrescue throw an error and exit unless either a logfile has
been specified, or a flag confirming no use of a logfile has been used.

It is very... not obvious how important the logfile is.  In my case, until
two days into running ddrescue.


I'm also curious why I'm only getting 5 megabytes per second between a pair
of drives on an SATA I (150 megabytes per second) controller.  I'm using
-n, and -c 100000.  And I've had 131kB of (3) errors out of 225782MB
so far.

I also find it odd that the -c option didn't noticably increase the speed.


It would also be nice if ddrescue started where it left off in the absence
of a logfile.  


Thanks for this software.

-- 
"...this thing we call 'failure' is not the falling down,
but the staying down." - Mary Pickford
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