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Parallel STL release within Intel(R) Parallel Studio XE 2018

Features / APIs:

- Aligned the implementation with the draft N4569 of the C++ standard.
    In particular, inner_product no longer supports execution policies.
- reduce and transform_reduce support unseq and par_unseq execution 
    policies if std::plus<> is used for reduction.
- Added counting_iterator and zip_iterator to support advanced use cases.
   To use, include pstl/iterators.h header file.
- Added macro PSTL_USE_PARALLEL_POLICIES to control usage of parallel
    execution policies (par, par_unseq); by default these are enabled.

Examples:

- Added dot_product and convex_hull samples to demonstrate Parallel STL
    usage.

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Parallel STL beta update release

Features / APIs:

- sequenced_policy is supported by all C++17 algorithms.
- Added other execution policies support for inner_product algorithm.

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Parallel STL beta initial release

Features / APIs:

- Implemented C++17 execution policies: sequenced_policy,
    parallel_policy, parallel_unsequenced_policy.
- Implemented unsequenced_policy based on the ISO C++ working group
    paper P0076R3.
- sequenced_policy is supported by all except a few C++17 algorithms.
- Other execution policies are supported by the following algorithms:
    adjacent_find, all_of, any_of, copy, copy_if, copy_n, count,
    count_if, equal, exclusive_scan, fill, fill_n, find, find_if,
    find_if_not, for_each, for_each_n, generate, generate_n,
    inclusive_scan, none_of, is_sorted, is_sorted_until, reduce,
    remove_copy, remove_copy_if, sort, stable_sort, transform,
    transform_exclusive_scan, transform_inclusive_scan,
    transform_reduce, unique_copy.

Documentation:

- Initial set of documents: Getting Started Guide, Release Notes.

Examples:

- Added gamma_correction sample to demonstrate Parallel STL usage.

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