C# Class SIL.FieldWorks.FDO.DomainServices.DataMigration.DataMigration7000019

Migrates from 7000018 to 7000019. JohnT: In this migration, at least, the model Writing System objects go away. Therefore it is important to preserve as much information as possible from them in LDML files which replace them. If there is already a relevant LDML in the folder we leave it alone. Otherwise if there is an appropriate one in the set we shipped with FieldWorks, we copy the relevant information from that. Otherwise we make one the best we can from the old writing system FDO object. This all gets more difficult as FieldWorks moves further away from version 7000019. The first version of this migration made the new LDML by creating an actual PalasoWritingSystem object, initializing it with the relevant data, and letting it save itself. This stopped working in July 2011, when WritingSystemDefn got more picky about what IDs it would accept. We could no longer use it for a data migration which does not include fixing the IDs. So far, we can still extract the information we want from the current LDML files in the release. This too may change.