bzr init ignores format argument when creating branch inside of shared repository

[Jelmer Vernooij]

bzr doesn't complain when specifying a format to "bzr branch" that is incompatible with the containing shared repository. E.g.:

bzr init-repo foo
bzr init --rich-root-pack foo/bar

will create a branch in foo/bar without rich root support.

bzr should either create a new repository in foo/bar or it should complain to the user.

[Alexander Belchenko (bialix)]

Even worse that user has no ability to forcing creation of standalone branch in shred repo. Command `bzr branch` has flag --standalone that will prevent of using existing shared repository, but `bzr init` has not. I think this flag should be supported by `bzr init` too.