Do not sort lists of ops given to OR-Sets

Sorting means that batch operations applied by the same actor
behave differently to separate operations applied linearly.
There is no need to sort, it is a throwback from some mistaken
assumptions in early development, before we had context removes.
Merge pull request #95 from basho/bug/rdb/no-sort-set-ops

Do not sort lists of ops given to OR-Sets

Reviewed-by: lenary