Python wrapper for ArrayFire 3.3

• Functions to interact with arryafire's internal data structures.
  - Array.offset
  - Array.strides
  - Array.is_owner
  - Array.is_linear
  - Array.raw_ptr
  • Array constructor now takes offset and strides as optional parameters.
  • New visualization functions: scatter and scatter3
  • OpenCL backend specific functions:
    • get_device_type
    • get_platform
    • add_device_context
    • delete_device_context
    • set_device_context
  • Functions to allocate and free memory on host and device
    • alloc_host and free_host
    • alloc_pinned and free_pinned
    • alloc_device and free_device
  • Function to query which device and backend an array was created on
    • get_device_id
    • get_backend_id
  • Miscellaneous functions
    • is_lapack_available
    • is_image_io_available
• Interopability
  • Transfer PyCUDA GPUArrays using af.pycuda_to_af_array
  • Transfer PyOpenCL Arrays using af.pyopencl_to_af_array
  • New helper function af.to_array added to convert a different array to arrayfire Array.
    • This function can be used in place of af.xyz_to_af_array functions mentioned above.
• Deprecated functions list
  • lock_device_ptr is deprecated. Use lock_array instead.
  • unlock_device_ptr is deprecated. Use unlock_array instead.
• Bug Fixes:
  • Boolean indexing giving faulty results for multi dimensional arrays.
  • Enum types comparision failures in Python 2.x
  • Support loading SO versioned libraries in Linux and OSX.
  • Fixed typo that prevented changing backend
  • Fixed image processing functions that accepted floating point scalar paramters.
    • Affected functions include: translate, scale, skew, histogram, bilateral, mean_shift.