Ports and their dependencies

[markd at macports.org]

>All jokes aside, would it be helpful to take the great
>explanations you have all written and integrating them into chapter 5.4.1
>of
>the MacPorts Guide
><http://guide.macports.org/#reference.dependencies.types>? Is this
>something that would benefit the MacPorts Community (even though I
>might have been one of the first people to ask such questions explicitly)?

I renamed "non-port dependencies" to "file dependencies".  See what you
think of the revisions in r37493.  It can be refined further if necessary.
 Thanks to Joshua and Ryan for the explanations.  

http://trac.macports.org/changeset/37493

Mark