BACKUP commit

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- Fixed problems in the transformation engine that prevented 
the list of transformation instructions from being iterated over while 
rewriting was performed. Fixed problems related to managing the life-time 
of induction variables in the case of nested loop where the transformed
instruction list is involved.

- Added missing evarista files from last commit.

- Added (working) tests for transformation in testsuite/scripting/rewrite*.esh

TODO: Fix a newly introduced bug two commits ago where the list of IR 
instructions fails to be printed in graph once the transformation has 
finished. Looks like we are freeing some expressions too early. I am 
trying to get rid of memleaks so dont blame me ;-)

Julien