Get the length of the Dimension.
Copy Constructor. used to make global dimensions
If unlimited, then the length can increase; otherwise it is immutable.
If variable length, then the length is unknown until the data is read.
Instances which have same contents are equal. Careful!! this is not object
If this Dimension is shared, or is private to a Variable. All Dimensions in
Set the Dimension length.
Set the name, converting to valid CDM object name if needed.
Set whether this is shared.
Get the Group that owns this Dimension.