Depends/Imports/Suggest/Enhence

  - 'Depends:foo1' if there is a function in foo1 that my package use often

No, better make use of Namespace imports all the time and only use 
"Depends" if you really need the other package to be installed. This is 
rarely needed.

Could you discuss this further?  It seems counterintuitive to me.

I'd expect every package which my package code calls to be a dependency.



We're short of vocabulary for the true pedants here, because I could see
the vignettes being described as something "my package calls", but I
don't mean that.

- Allen S. Rout