This PR adds support for the AlternateNamesV2 file type (see #5). It really just adds two new fields to the AlternateName entity that existed already - To and From, denoting the start and end of the historical period during which a particular alternate name was in usage. These fields have a type of String - I wasn't sure if this was the most appropriate type (versus DateTime, for example) but there seem to be a good few edge cases in the data itself (see, for example, alternate name ID 13653649). Tests and some new test data are included.
This PR adds support for the AlternateNamesV2 file type (see #5). It really just adds two new fields to the AlternateName entity that existed already - To and From, denoting the start and end of the historical period during which a particular alternate name was in usage. These fields have a type of String - I wasn't sure if this was the most appropriate type (versus DateTime, for example) but there seem to be a good few edge cases in the data itself (see, for example, alternate name ID 13653649). Tests and some new test data are included.