Mutex stuff movibg to C

include/YapError.h

@@ -54,7 +54,8 @@ typedef enum
   EVALUATION_ERROR_UNDERFLOW,
   EVALUATION_ERROR_ZERO_DIVISOR,
   EXISTENCE_ERROR_ARRAY,
-  EXISTENCE_ERROR_KEY,
+  EXISTENCE_ERROR_KEY,  
+  EXISTENCE_ERROR_MUTEX,  
   EXISTENCE_ERROR_SOURCE_SINK,
   EXISTENCE_ERROR_STREAM,
   EXISTENCE_ERROR_VARIABLE,
@@ -121,6 +122,7 @@ typedef enum
   TYPE_ERROR_UBYTE,
   TYPE_ERROR_UCHAR,
   TYPE_ERROR_VARIABLE,
+  UNINSTANTIATION_ERROR,
   UNKNOWN_ERROR
 } yap_error_number;