BZ 6954: Automagic printing for ++ operations

[Rajan Arora]

Here is a second go at the patch incorporating a few suggested improvements.

Rajan Arora wrote:
> Hello everyone,
>
>  Attached is a patch for the BZ 6954 bug - automagic printing for ++ 
> operations on global variables. A few tests in the testsuite seem to 
> have broken after applying this patch but I suspect that is mostly 
> because of the automagic printing in place and I am working on them. 
> Meanwhile, please have a look and feel free to reply with any 
> suggestions/feedback.
>
> Cheers
> -Rajan

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