Fixing error message.
Modifying comments.
Updating DataSet to implement ModifiableByName.
Adding "ModifiableByItem" to DataTable and DataSet.
Fixing Vector Extensions bounds checker.
Fixing Row Count in toString method.
Fixing DataSet and adding Unit Tests.
Updating Data Set Unit tests.
Updating Data Set Unit tests.
Fixing issue where add / insert / replace type check on data values was not working.
SBT build style updates.