Gege-Wang

If we pass parameter working_dir when we start daemon then we can manage working_dir just like machine_id, When a node is started, the coordinator passes the working_dir of the corresponding...

There are some issues about `dora start` and `dora check` to skip checking paths on remote machines: - if cli and coordinator are local, some daemons are on remote machines,...

@phil-opp since the dataflow check is needed in cli and coordinator, I prefer to skip all path exist check in multiple daemons. the path exist check should be done by...

> I'm not sure whether it's a good idea to implicitly change the working directory based on the number of machines. I have considered this question. since the check path...

I left some issues about absolute path in #535 and why this PR is conflict with #538.