BugDir._in_memory was a stupid idea. Took it back out.

It was too confusing having three memory access levels:
  1) syncronized
  2) explicit
  3) memory-only
with .sync_with_disk selecting between 1 and 2/3 and ._in_memory
selecting between 2/3.

Now there are only two:
  1) syncronized
  2) memory-only excepting explicit BugDir.save() calls.

I avoid the problem of non-syncronized loading of on-disk bugs in
simple_bug_dir by restricting .list_uuids() to in-memory bugs when
.sync_with_disk==True.

Beyond that, I shifted the order of the BugDir methods around a bit so
that they were better grouped according to general idea.

Note that the DiskAccessRequired exceptions on filesystem access when
.sync_with_disk==False should be propogated to the Bug and Comment
methods, but I haven't done that yet.

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