+ remove round up in -r mode to read the requested amount of bytes
+ remove the 0x307 check and stash the old ReadBinaryBlob method

Signed-off-by: bmx <none>

with better target detect

also check if the target is connected, instead of reading nonsense in the void
and cherry on top, check for -h flag at the top to avoid plugging something to get help

Signed-off-by: bmx <none>

* Blink now blinks D4 too
* Don't use compressed instructions by default.  Some compilers are old.
* Prevent double-halting on linke programmer.

Also fix 2 warnings.