^C was very broken: break was not accepted, and debug,

trace and statistics did not work at all.


git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1448 b08c6af1-5177-4d33-ba66-4b1c6b8b522a

C/sysbits.c

@@ -1254,6 +1254,10 @@ InteractSIGINT(int ch) {
 #endif
     }
     return -1;
+  case 'b':
+    /* continue */
+    Yap_signal (YAP_BREAK_SIGNAL);
+    return 1;
   case 'c':
     /* continue */
     return 1;