add easyblock for installing Allinea tools

This currently requires X forwarding to be enabled, and thus this is not ready to be merged in yet (although it works fine)...

We need to figure out a way around the X forwarding mess.

The `ddt` tool *doesn't* require X forwarding when a `~/.allinea/system.config` file is present already, but does require it to (re)generate one. Maybe putting a dummy file there would work?