Issue 414: for some functions, the parameters were evaluated twice (for example "char(nextval(..))" ran "nextval(..)" twice).

Added compatibility for "SET NAMES" query in MySQL compatibility mode.

The ResultSetMetaData methods getSchemaName and getTableName could return null instead of "" (an empty string) as specified in the JDBC API.

Revert auto-registration of function aliases (tests fail); fix for "Transaction log could not be truncated"

The message "Transaction log could not be truncated" was sometimes written to the .trace.db file even if there was no problem truncating the transaction log.