[netcdf-java] NcMLWriter support for values

[Nick Bower]

I wanted to enable <values> output in an ncml dump, say in NcMLWriter or 
at least provide a custom writer that possibly re-uses NcMLWriter.

On determining whether to output values, NcMLWriter does a 
Variable.isMetadata() check, so I went looking for a hook here.  
Unfortunately there is no setIsMetadata method on VariableIF, no ability 
to do "Variable.isMetadata = true" (it's protected) and no way to 
over-ride NcMLWriter.writeVariable (it's private with no public api 
exposure).

So basically I need to code a new writer class - I just mention this 
because NcMLWriter really needs fixing up (plus no interface etc - ncml 
is useful!).

Thanks, Nick
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