zodb - Tool to drive them all
We already have 3 commands in zodbtools suite (zodbanalyze, zodbdump & zodbcmp) and this is going to grow. And it was already noted some time ago with TODO (in 66946b8d) that we need only one command driver to invoke everything. So do it: introduce `zodb` command which can invoke other subcommands and show general help or help for subcommand or a topic. The structure is modelled after `git` and `go` commands. Help topics are for now empty but we'll add one help topic in the next patch.
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