Delete auto-migrating mode for the time being.
Allow MODIFY COLUMN even for SQLite3.
Make it possible to modify primary keys.
Delete integral.type:char.
Set :col-type when generating slots.
Load init files for unit tests when load-op.
Add table-class-indices.
Make it possible to add UNSIGNED to a data type in column definitions.
Sync indexes when the class is redefined.
Add auto-migrating-mode.
Add DATETIME, DATE and TIMESTAMP.
Fix :generate-slots.
Make select-dao allow to take multiple clauses and expressions.
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