#51 Mark Occurrences editor feature

[Jan Ploski]

(Proposed by Katrin Dust:)
Mark all occurrences of an element (e.g. a variable) in
the editor whenever a caret is moved into it. This
should behave just like the Mark Occurrences feature of
the Java editor. A preference to enable/disable this
feature should be added as well.

[Jan Ploski]

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Implemented in CVS by Katrin.