[MERGE] log -n/--levels

[Ian Clatworthy]

Thanks to John for his review and tweak vote. I'm resubmitting rather than
tweaking though as the proposed UI has changed ...

Ian Clatworthy wrote:

> Another possibility is --XXX=integer where 1 means flat and 0 means fully
> nested. Options for XXX include --nested, --depth and --levels. I can
> imagine some users liking to show just the one extra level down at times
> instead of linear vs everything, particularly when using PQM.

Vincent, fullermd, poolie and I chatted about this on IRC the other night.
In the end, the consensus was that --levels/-n was the way to go and that
a value of 0 meaning all was fine, given asking for zero levels didn't
make much sense otherwise.

So this patch lets --long fans see just the mainline:

  bzr -n1

And --short/--line fans to see the full graph:

  bzr --short -n0

And everyone to look down just below PQM commits if they want:

  bzr -n2

It also improves the --short output so that revisions with dotted revnos
have their details indented correctly, even in column 1.

Ian C.
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