* kbx/backend-sqlite.c (DATABASE_VERSION): Set to 2.
(DATABASE_VERSION_MAX): New.
(table_definitions): Rename field special to name and adjust users.
  <table fingerprint>: Drop the PRIMARY KEY from the fpr column.
(migrate_from_v1_to_v2): New.
(create_or_open_database): Detect a bad database version and try to
migrate it.