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Advanced Subexpression Insertion

Frederik Hennig requested to merge da15siwa/pystencils:subexpression_insertion into master

Moved a few methods for elimination of selected subexpressions from lbmpy to pystencils. Helpful to control the granularity of common subexpression elimination, expression tree cleanup, and potentially to simplify equations by substituting constant or zero subexpressions.

Edited by Frederik Hennig

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