cleanup

- fix possible crash in conc (but it's still an ugly hack)
- fix noob usage of strcmp
- flag some memory leaks (it would be nice, if the author(s) would clean
   up the mess himself)
- fix crash in substr
- whitespace cleanup

there are plenty more memory leaks in command.cpp - for example, every
goto in cubescript does not clean up anything

source/src/crypto.cpp

@@ -845,9 +845,9 @@ bool checkchallenge(const char *answerstr, void *correct)
 
 ////////////////////////// crypto rand ////////////////////////////////////////
 
-#define N (624)             
-#define M (397)                
-#define K (0x9908B0DFU)       
+#define N (624)
+#define M (397)
+#define K (0x9908B0DFU)
 
 static uint state[N];
 static int next = N;