fedora-entities-en.xml deprecated

[Karsten Wade]

We need to use the new file in common/fedora-entities-en.ent.  This
should be a single line change in your parent XML file:

<!ENTITY % FEDORA-ENTITIES-EN SYSTEM "../../common/fedora-entities-en.xml">

becomes

<!ENTITY % FEDORA-ENTITIES-EN SYSTEM "../../common/fedora-entities-en.ent">

I forgot who mentioned this or even if there is a bug report for it.
It's just one of those small Right Way To Do Things we can fix easily.

The deprecated file will remain for a short while, but ALL DEVELOPMENT
WORK WILL STOP.  I don't want to port over changes made to the *.ent
file.  We have such a small documentation set this is the easy, painless
time to make this change.

cheers - Karsten