[netCDFJava #XQL-423495]: java VLEN variable attributes

Vlen support is hidden and is represented by using a variable
length dimension "*".
See here, for example.
https://www.unidata.ucar.edu/software/thredds/v5.0/netcdf-java/CDM/VariableLengthData.html

=Dennis Heimbigner
  Unidata


Ticket Details
===================
Ticket ID: XQL-423495
Department: Support netCDF Java
Priority: Normal
Status: Open
===================
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