More work on hyperlinking/open definition and JDT integration.

Hello,

Thanks to help of Johannes Rudolph I found how to track changes
happening in trunk of Eclipse plug-in.

The only problem is that svn log does not help that much:
http://lampsvn.epfl.ch/trac/scala/changeset/18663/scala-plugin/trunk

The message for change says:
"More work on hyperlinking/open definition and JDT integration."

This is so generic that could be repeated for many commits and does not
really describe what's been changed, why and what's the rationale for
given change. The change itself is rather big so it's not so easy to
review and understand it.

I'm wondering if this could be improved. That would make life of new
contributors MUCH easier.

For inspiration one could have a look at how Git community deals with it:
http://repo.or.cz/w/git.git?a=blob;f=Documentation/SubmittingPatches;hb=...