Reorder standard descriptors to a more logical order

In many cases, data standard descriptors are listed in an arbitrary order - look at GradeLevel for example.  This makes it difficult to determine if a value is present. These should be re-ordered. Suggest using these principles:

• if there is a natural or logical order, use that ordering - e.g. GradeLevel
• order other lists alphabetically

Could start with the lists for which this is most confusing - e.g. GradeLevel