'hf 14b sniff' - removed stuff which wasn't very useful. cleaner now. Not sure if it works :(

'hf iclass sniff' - playing with this one.  Don't expect it to work yet :(
   - increase dma_buffer_size to 256
   - moved initialization to a own function. Just looks cleaner :)
   - change the debug output to follow MF_DBGLEVEL
'hf mf sniff' - unnecessary cast removed

client/cmdhfmf.c

@@ -901,7 +901,6 @@ int CmdHF14AMfNested(const char *Cmd) {
 		
 		uint64_t t2 = msclock() - t1;
 		PrintAndLog("Time to check 6 known keys: %.0f seconds\n", (float)t2/1000.0 );
-		
 		PrintAndLog("enter nested...");	
 		
 		// nested sectors