Dealing with a port being merged into another

[Raphael Kubo da Costa]

Hi everyone,

One of the changes we (kde@) have made in the upcoming Qt 5.3.2 update
is merging devel/qt5-qmldevtools into lang/qt5-qml.

I'd now like to know what needs to be done to make it easy to everyone
to upgrade their ports. By everyone I mean people using pkg as well as
people using port{master,upgrade,whatnot}, and by "make it easy" I mean
I don't want to have to write an UPDATING entry (that many people will
not read) that tells people they need to manually remove qt5-qmldevtools
from their systems before upgrading.

Do I need CONFLICTS_INSTALL? Will everything be handled automatically?
Is the UPDATING entry inevitable?