Open questions related to udunits package

[lesserwhirls]

Open questions to address or get into milestone related to the udunits module:

• Do we support same grammar as udunits-2
  • Bison grammar - we have javacc .jj grammar files, udunits-2 C uses bison .y grammar files
• Do we support same database of units? What’s different?
  • Good place to start - test against this

[lesserwhirls]

Prior to #1461, the JavaCC .jj grammar generated classes (generated ~2006 or earlier) were included in the repo. We now generate the classes at build time.