MERGED: @holimans changes

MERGED: @piwi changes
MERGED: @marshmellows changes.

I'm not even gonna try write up all that stuff..

ADD: changed some commands inside the "Hf 14a sim" on deviceside.
ADD: @mobeius "two nonce" version for mfkey32.   It is also inside the "hf 14a sim" with the "x" parameter.

armsrc/iso14443b.c

@@ -525,6 +525,7 @@ static struct {
  *          false if we are still waiting for some more
  *
  */
+ #define abs(x) ( ((x)<0) ? -(x) : (x) )
 static RAMFUNC int Handle14443bSamplesDemod(int ci, int cq)
 {
 	int v = 0;