Entity tools

Something that Conglomerate does that I don't think is well-supported by
other XML editors is entity-handling.

I just committed code so that if you right-click on an entity reference,
you get the option to convert it into a copy of that entity (as opposed
to a reference).  It kind-of works... up to the point where an assertion
fires in the editor code :-(

However, I believe the basic idea is sound, and I plan to add some more
entity manipulation code e.g. the Find & Replace dialog to have a
"Replace All With Entity" feature (I needed this the other day with a
document I was writing).

Thoughts?  Ideas?

Dave
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