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This reverts commit aa7b6447.

This reverts commit 97a8bae4.

For those pages where threading is important, we now have an extra filtering stream
class to skip stuff in conversations that have "already" been seen.

Revert "Paging fix for public timeline: drop replies from the stuff we pull in for the threaded web view."

This reverts commit 880661de.

There were some differences between defaults for the
NoticeStream::getNoticeIds() function and some of its subclasses'
implementations. So, I got them rationalized.

Added filtering code so that notice streams check notice scope.

Added new class to implement filtering a stream, FilteringNoticeStream.

Added a subclass that does the logic for checking Notice scope.

And made all the streams use ScopingNoticeStream.

Rearchitect (again!) notice stream code to delegate different functionality up and down the stack.

Now, different classes implement NoticeStream.