Eccodes

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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()

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- ECC-1110: Removed obsolete function codes_close_file()
- Provide missing argument to exceptions
- Fix codes_set_definitions_path() typo
- Fix grib_get_double_element(). Missing last argument
- Add more tests to increase coverage
- GitHub pull request 15: Add .__next__() method to eccodes.CodesFile class
- ECC-1113: Python3 bindings under Windows: codes_get_long_array returns incorrect values
- ECC-1108: Python3 bindings under Windows: use of handle causes crash
- ECC-1121: Segfault when closing GribFile if messages are closed manually

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- Update Copyright notices
- Function-argument type checks: Improve error message
- Fix C function calls for codes_gribex_mode_on/codes_gribex_mode_off

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- ECC-1029: Function-argument type-checking should be disabled by default.
To enable these checks, export ECCODES_PYTHON_ENABLE_TYPE_CHECKS=1
- ECC-1032: Added codes_samples_path() and codes_definition_path()
- ECC-1042: Python3 interface writes integer arrays incorrectly
- ECC-794: Python3 interface: Expose the grib_get_data function

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- Added new function: codes_get_version_info
- ECC-753: Expose the codes_grib_nearest_find_multiple function in Python
- ECC-1007: Python3 interface for eccodes cannot write large arrays