Important fix for package-building: use parent.frame() for environment arguments instead of .GlobalEnv
Pulled out requirementNames() from VariableNetwork(), to aid debugging.
We don't use NetworkInteroperability any more.
In VariableGenerator, make sure that requirements is a list.
Not using getPMconnections any more.
Use try() to protect the intentionally bad call to rotateStarts, so that package build succeeds.
More notes.
More notes.