Eccodes

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- Fix the recommended version

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- ECC-1231: Remove the experimental high-level interface
- Added the "findlibs" module
- Fix tests/test_high_level_api.py when MEMFS enabled
- ECC-1226: Python3 bindings: Typo causes AttributeError when calling codes_index_get_double

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- Added test for multi-field GRIBs
- Fix deprecation warning: `np.float` is a deprecated alias for the builtin `float`
- Experimental feature: grib_nearest_find

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- ECC-1171: Performance: Python bindings: remove assert statements
- ECC-1161: Python3 bindings: Do not raise exception on first failed attempt
- ECC-1176: Python3 bindings: float32 recognised as int instead of float
- GitHub pull request 41: Remove the apparent support for Python 2
- GitHub pull request 44: Fix CFFI crash on windows
- GitHub pull request 42: Add unit testing with GitHub actions (linux, macos and windows)

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- ECC-1143: CMake: Migration to ecbuild v3.4
- ECC-1133: C API: Propagate const char* for codes_index_new_from_file and codes_index_select_string

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- Support for ecmwflibs. An additional way to find ECMWF libraries (if available)
- ECC-1140: Segfault from invalid pointer reference in grib_set_double_array()