remove unused attributes

refine docs for mempool.h - issue #548

refine docs for map.h - issue #548

refine docs for list.h - issue #548

refine docs for linked_list.h - issue #548

refine docs for streams.h - issue #548

refine docs for test.h - issue #548

refine docs for json.h - issue #548

refine docs for iterator.h - issue #548

refine docs for hash_map.h - issue #548

refine docs for hash_key.h - issue #548

refine docs for common.h - issue #548

refine docs for compare.h - issue #548

refine docs for collection.h - issue #548

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