#requestString broken when using strings instead

[marianopeck]

Because of #64 in which we store strings rather than native request, the requestString of WAObjectLogEntry fails. In #71 @dalehenrich recommends adding a new instVar requestString. I agree with that. And we should fix all senders of WAObjectLogEntry which pass a request...

[jbrichau]

So, for Seaside 3.1.4.2, I will just 'fix' the persistence of the request by adding a variable requestString, essentially making the request instvar unused by the standard implementation.

In Seaside 3.2.x, I think about having a try to persist a WARequest instance, so it does not persist a socket but we still have all info about the request in the log.