Added neutral as an additional parameter to mapreduce and accumulate
#20
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Adding
neutralto distinguish between the op zero andinitas an initially-accumulated value, which is now respected. Added tests for this. This is unfortunately a breaking change, as some code that was only usinginitbefore with customopwill now need to defineneutralas well - hence the version change. Merged reduce into mapreduce.anyandallnow specify analglikeaccumulatedoes, which is more elegant and future-proof (and breaking too, yay). Added comments on usingconst.