I have no idea what initially went wrong between the two of you and frankly I don't care.
But the behavior of both of you starts hurting this community and probably the Neo900 project. So please stop it!

@Estel:
I see some misconceptions on your side (project files vs. schematics) and some claims about Joerg that you can't or at least didn't support with facts (essential(!) edits of his posts).

@Joerg:
I've been a moderator in some other forums and I think you're abusing your powers here by banning Estel. I always considered it a taboo to take action in an issue I was personally involved in. And you are clearly personally involved here. Ask another unbiased moderator to judge the situation!

I suggest you both go your own ways, try to minimize your contact and find a mediator if you can't avoid it. I'm volunteering for that role on Neo900-related topics as far as I'm able to understand the technical background.