Comments in attribute definitions are now optional. Added the 'verbose' option in dj.set.
amending previous commit
dj.Relvar/insert now takes cell arrays as input
Added property ancestors to dj.Table
fixed issue #30. dj.AutoPopulate can now populate ancestor tables recursively.
added dj.GeneralRelvar/show to show the relation's header
Added export/import functions to dj.GeneralRelvar and dj.Relvar, respectively
bug fixes from today's commits
added dj.GeneralRelvar/export and dj.Relvar/import.
A dedicated relvar class is no longer required to reference a table.
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added the global setting for bigint_to_double in dj.set
fixed bug in erd
added the ability to add new attributes in a specific position among existing attributes