The escript wrapper now determines ESCRIPT_ROOT based on the position of the
script rather than the value inserted at compile time.
This is one step towards making binary releases less tied to a known location.
SConstruct now keeps escript root at the front of LD_LIBRARY_PATH and PYTHONPATH
The wrapper script now accepts a -e arguement.
This doesn't actually run anything but outputs a set of exports which one can
eval to give you the same environment as the wrapper.
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