Update to 0.42
- New upstream release 0.42
- added $db->Env method to retrieve environment object from a database object
- get the tied interface to use truncate in the CLEAR method if available
- Build with libdb (Berkeley DB 5.x) from Fedora 14 onwards (#612139)
- Tag BerkeleyDB.pod as %doc
- Use DESTDIR rather than PERL_INSTALL_ROOT