Child processes send trace information back to the parent. Also fixed weird double-activation of children.

git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@3729 ed5197a5-7fde-0310-b194-c3ffbd925b24

src/task.h

@@ -31,6 +31,7 @@ typedef enum _tf_task_message_t {
 	kGetExports,
 	kLoadFile,
 	kTaskError,
+	kTaskTrace,
 } tf_task_message_t;
 
 tf_task_t* tf_task_create();