1. Make it work for files within a single session. 2. Make it work for files across sessions. 3. Make other data sources consistent with files. closes #181 --HG-- extra : rebase_source : 29b07b914508b8fcef1a4e4c212d32e5f21dd50e
1. Make it work for files within a single session. 2. Make it work for files across sessions. 3. Make other data sources consistent with files. closes #181 --HG-- extra : rebase_source : 29b07b914508b8fcef1a4e4c212d32e5f21dd50e