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Fix ReduceByKey general algorithm to work with parallel ScanInclusive.  Use bit representation for states.

TBB sort by key zip array fix

The original codes do not accept when the zip handle array contains two different storage types

See merge request !25

A more general Copy that allows copying into a diff. array type.  Testing codes are added.

See merge request !33

Fancy Arrays as input to Device Algorithms

Currently working on the general approach to get ArrayHandleZip/Permutation to be handled by all device adapter algorithms.

See merge request !32

Instead of having a single specialization for sort and zip handles,
we know handle any fancy handles being passed to the cuda device adapter.
This was done by reworking how we represent fancy iterators inside thrust,
and instead of using a transform iterator + counting iterator we just use
a iterator_facade.

Merge branch 'tbb_SortByKey_ZipArray_fix' of https://gitlab.kitware.com/chunmingchen/vtk-m into tbb_SortByKey_ZipArray_fix

Merge branch 'test_tbb_SortByKey' into tbb_SortByKey_ZipArray_fix

Conflicts:
	vtkm/cont/testing/TestingDeviceAdapter.h

Fix a couple of conversion warnings in OptionParser for testing.

See merge request !31

Allow in-place sorting of ArrayHandleZip

See merge request !29

This is required so that we can use ArrayHandleZip with Sort/Reduce and
custom comparison operators. ArrayZip and PortalValue don't combine
well together, when used with DeviceAlgorithm that has a custom operator.
The custom operator is actually passed the PortalValue instead of
the real values, and by that point we can't fix anything since we
don't know what the original operator is.

We have increased the ARRAY_SIZE for the TestingDeviceAdapter to work
around issues with backends not using parallel algorithms for arrays of length
500 or less.

This is required so that they can be sorted, which happens when sorting
an ArrayHandleZip.

For now the pair's numeric type is determined by the first elements type.

Explicitly invoke all thrust algorithms using the cuda policy.

This is required if we ever want to use thrust from another device adapter.

See merge request !30

This is required if we ever want to use thrust from another device adapter.

Add PointElevation Worklet

See merge request !28

Allow creation of vtkm::cont::Field without any data.

This is needed to allow Field's to be used as output.

See merge request !27

Update readme url

See merge request !1

This is needed to allow Field's to be used as output.

Indexed serial sort by key

See merge request !26