Clean up interface to PM and VFS

- introduce new call numbers, names, and field aliases;
- initialize request messages to zero for all ABI calls;
- format callnr.h in the same way as com.h;
- redo call tables in both servers;
- remove param.h namespace pollution in the servers;
- make brk(2) go to VM directly, rather than through PM;
- remove obsolete BRK, UTIME, and WAIT calls;
- clean up path copying routine in VFS;
- move remaining system calls from libminlib to libc;
- correct some errno-related mistakes in libc routines.

Change-Id: I2d8ec5d061cd7e0b30c51ffd77aa72ebf84e2565

servers/vm/break.c

@@ -49,8 +49,8 @@ int do_brk(message *msg)
  */
 	int proc;
 
-	if(vm_isokendpt(msg->VMB_ENDPOINT, &proc) != OK) {
-		printf("VM: bogus endpoint VM_BRK %d\n", msg->VMB_ENDPOINT);
+	if (vm_isokendpt(msg->m_source, &proc) != OK) {
+		printf("VM: bogus endpoint VM_BRK %d\n", msg->m_source);
 		return EINVAL;
 	}