“In regard to issue estoppel, no peculiarity of that doctrine has been asserted in regard to habeas corpus proceedings. I do not think that there is any. The issue estoppel in this case is said to arise from the decision of this court on20 June 1990 . That was a decision on an interlocutory application. That it was a decision on an interlocutory 15 application does not, in my judgment, disable it from an ability to give rise to an issue estoppel. I can see no reason in principle why a final decision upon an interlocutory application should not be in this regard treated as is any other decision.”