src/kahua/persistence.scm: check Gauche-dbi 0.2 and later in read-kahua-instance and write-kahua-instance.
src/kahua/persistence.scm: check Gauche-dbi 0.2 and later in read-kahua-instance and write-kahua-instance.


git-svn-id: 5612f2e019210c57871f2dc3f2fceb099e3c14ff@1221 4e392e78-dc3f-dc11-8fd5-00188bfc9ac4

kahua/Kahua,kahua/Kahua