Add 'size_of' test for netcdf plugin

[Yushan-Wang]

Fix #446

Add support for size_of in decl_netcdf plugin Usage: only in read section

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• [x] you have added a line describing your changes to the Changelog;
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[jbigot]

Looks like when you apply indentation this messes up md files. Do you know why?

[Yushan-Wang]

Looks great. Could you add a separate issue on giving better error messages when the user specifies incompatible options in the config of the NetCDF of HDF5 plugins, e.g. both ".size_of" and ".when". Also could you add yet another one about proposing a better yaml syntax for the "size_of" case.

Currently, the when clause can work compatibly with size_of.

[Yushan-Wang]

Looks like when you apply indentation this messes up md files. Do you know why?

Yes, it was because when I was editing the changelog, my IDE automatically formatted the file. And I pushed without checking with the test_indent.

[jbigot]

Looks great. Could you add a separate issue on giving better error messages when the user specifies incompatible options in the config of the NetCDF of HDF5 plugins, e.g. both ".size_of" and ".when". Also could you add yet another one about proposing a better yaml syntax for the "size_of" case.

Currently, the when clause can work compatibly with size_of.

Ah, true! I missedit.