bug#6347: re-builder.el initial patch

[Lennart Borgman]

Here is an initial path for re-builder.el. It tries to add the following:

- Syntax-hilighting in re-builder window
- Some small menu fixes
- copy regexp did not take care of new lines
- Try to stay where you are when starting re-builder

Comments?

I will add copying to regexp from target buffer later.

re-builder-1.diff
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