gloablenv

Hi!

Thank you for the very useful package. I was wondering if there is an option to visualize dependencies between functions in my global environment somehow? I tried:

```
dep <- envirDependencies(globalenv())
dep <- envirDependencies("R_GlobalEnv")
```
both giving the error:
```
Error in loadNamespace(name) : there is no package called ‘NA’
```

Thank you,
Azza