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Sort headers/global definitions to enable reproducible code generation

Stephan Seitz requested to merge seitz/pystencils:sort-headers into master

headers and global_declarations are generated by methods that return sets. So even with the same inputs it is not guaranteed that the same source code is generated since sets do not guarantee a specific order when iterating over them.

I was supprised that my generated code could often not be reused from the cache. The problem was that the included headers appeared in random order.

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