Offset Reduction

[mroethlin]

Technical Description

A rough implementation of the work around described in the google doc about path dependency. The implementation is complete in the sense that there is SIR, IIR representation of the offset, dawn4py hooks and code generation in both backends. However, no safety is provided:

• There are no facilities to check that the right amount of offsets was passed. Passing too many offsets will lead to ignored values, passing too few will lead to a segfault (in the best case).
• There is no type checking for the sparse field being offset.

DO NOT MERGE

[mroethlin]

to be reopned from origin branch