Add support for PDT 4.32 and change PDT class structure #130
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This commit provides support for PDT 4.32.
This is the first PDT that deviates from the "base" structure of PDT 0. In 4.32, the fixed surface attributes are not present. Therefore, need to remove section 4 attrs from the Grib2Message class and define elsewhere.
The solution provided here is to create 2 new PDT-related template classes as "base" classes. These are ProductDefinitionTemplateBase and ProductDefinitionTemplateSurface and they can be inherited by the actual PDT classes.
Also here is a change to the wgrib2-formatted level string to provide the string 'no_level'.
This commit references #128