Do not catch and rethrow scheduler exceptions at each stage of the AST.
Do not catch and rethrow scheduler exceptions at each stage of the AST.

This was done for perfomances sake (see comments). It speeds up by 27%
normalized assignments in a group, for instance.

    * src/runner/interpreter.cc: Do not catch scheduler exceptions.

aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi