Various minor fixes.

Removed some commented out code.
Removed excessive printfs.
Fixed spid not initialising for mm0
Fixed some faults with fs0.

TODO:
- Need to store vfs files in a separate list.
- Need to define vnum as a vfs-file-specific data, i.e. in priv_data field of vm_file.
- Need to then fix vfs_receive_sys_open.

tasks/fs0/src/task.c

@@ -115,6 +115,7 @@ struct tcb *create_tcb(void)
 	if (!(t = kmalloc(sizeof(*t))))
 		return PTR_ERR(-ENOMEM);
 
+	t->fdpool = id_pool_new_init(TASK_OFILES_MAX);
 	INIT_LIST_HEAD(&t->list);
 	list_add_tail(&t->list, &tcb_head.list);
 	tcb_head.total++;