[MERGE] Make dpush help/error a bit more generic

[Jelmer Vernooij]

dpush' help and errors currently suggest that dpush is useful when
pushing into foreign branches, while in fact it's only useful to push
between branches in different vcs'es. bzr-git now supports pushing
from local into remote git branches and, since there is no conversion
necessary there, the current dpush descriptions are a bit confusing.

The attached patch fixes the dpush help/error.

Cheers,

Jelmer
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