now testing that endianness can only be set on atomic ints and floats #1530
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Fixes #1479
As is clearly stated in the documentation for nc_def_var_endian():
Warning: this function is only defined if the type of the variable is an atomic integer or float type.But this was not actually being checked in the code. Setting the endianness for other types is not safe. If there is an interest in controlling endianess for user-defined types, we can pursue that as a separate and new feature. (But no one wants it anyway.)
In this PR I add checking to ensure that endianness is only set on atomic integer or float types. Tests are added to confirm.