[MERGE][0.15] Better error on incompatible formats

[Aaron Bentley]

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Hi all,

This patch gives a better error when you try to fetch from an
incompatible repository.

Currently, you get a traceback:
$ bzr pull -d foo bar
bzr: ERROR: exceptions.NotImplementedError: <bound method
InterRepository.fetch of <bzrlib.repository.InterRepository object at
0x40744a6c>>

Traceback (most recent call last):
  File "/home/abentley/bzr/bzr.dev/bzrlib/commands.py", line 638, in
run_bzr_catch_errors
    return run_bzr(argv)

This patch changes it to a better error:
bzr: ERROR: Repository
KnitRepository('file:///home/abentley/bzr/bzr.ab.integration/foo/.bzr/')
is not compatible with repository
KnitRepository3('file:///home/abentley/bzr/bzr.ab.integration/bar/.bzr/')

While this situation isn't common today, it will become common as people
start using nested trees, and it would be bad if mere repository
incompatibility caused tracebacks.

Aaron
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