BZ 6701 - Improve error messages (updated-patch)

[Rajan Arora]

Hello everyone:

  First of, thanks Frank for all your detailed comments - all 
incorporated, except for taking care of the exceptionally long lines. In 
that case too, the `^' wraps up correctly along with the desired column, 
but the wrapped up source line may cause some issues. Anyhow, the 
alignment works correctly now for tabs in the source line and for that 
matter, spaces mixed with tabs. Please have a look at the updated patch, 
and any further suggestions are more than welcome.

best
-Rajan

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