Invoke create() on RandomTag on the concept, as it is declared as static method.
Merge remote-tracking branch 'origin/master'
Fix hasError conditions for ExecutionEnvironment to accept a local job area.
Make I_MS_home solution working again.
Add XChart to the list of dependencies of the Interactive MPS plugin. This should not have been necessary because XChart is already listed as a dependency of the GobyWeb plugin, on which Interactive depends. However, not specifying this dependency triggers MPS issue https://youtrack.jetbrains.com/issue/MPS-20565, so for now, we specify it.
Reorganize assemble-plugins.sh to delete the previous plugin file before build, and to copy the built plugin to target/plugins.
Adjust standalone build script to use pre-packaged plugins.