[MERGE] compare_trees with all unknowns

[John Arbash Meinel]

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We currently have a bug in 'bzr status' if you supply a path to an
unknown file.

https://launchpad.net/products/bzr/+bug/53638

Basically, 'compare_trees' only operates on versioned files, so if you
pass a 'specific_files' list with only unversioned files, it sees no
files to work on, and does a full compare.

While I was at it, I was very surprised to see that we don't have any
direct tests of 'compare_trees'. Considering it is one of our workhorse
functions I added what I consider a good starting set of tests. (I don't
test all the permutations of specific file lists and
add/modified/removed/etc) But I test each individually.

Anyway, the attached patch reveals the bug for compare_trees, and fixes
it. It doesn't test that 'status' does the right thing, but since 'bzr
status' was exposing the bug the compare_trees, I think this is okay.

John
=:->

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