How to remove a port from MacPorts? (Guide update concerning replacing, renaming and removing ports now open for proof-reading)

[Marko Käning]

Hi Ryan and others,

as promised I tried to write something up for the Guide concerning this thread's topic… (Committed as r76822.)

Please check whether you've additional suggestions for the newly introduced sections 4.7.6 and 4.7.7!

Greets,
Marko