* 0.2.3:
 * -------------------
 * 1- SSH compression has been added.
 *    The parameter: ssh.compression.level
 *    No compression:0, Max compression:9, Default compression:-1(that is 6)
 *
 * 0.3.0:
 * -------------------
 * New Features:
 * 1- Forcing archivelog generation in each archivelog transfer period has been removed.
 *    Use Oracle ARCHIVE_LAG_TARGET initialization parameter instead.
 * 2- The changed messages:
 *    old: ubGuard-1 [<returnCode>]: Unable to acquire lock by DBMS_LOCK.REQUEST().
 *    new: ubGuard-1 [<taskID>,<returnCode>]: Unable to acquire task lock.
 *
 *    old: ubGuard-2 [<returnCode>]: Unable to release lock by DBMS_LOCK.RELEASE().
 *    new: ubGuard-2 [<taskID>,<returnCode>]: Unable to release task lock.
 *
 *    old: ubGuard-5 No UBGUARD_TMP_ARCHIVE directory found in ALL_DIRECTORIES.
 *    new: ubGuard-5 Oracle directory UBGUARD_TMP_ARCHIVE not defined.
 *
 *    old: ubGuard-4 No standby found.
 *    new: ubGuard-4 Standby not defined.
 *
 * 3- The removed messages:
 *    ubGuard-3: <message>
 *    ubGuard-6: Archivelog transfer period not defined.
 *
 * Bugs:
 * 1- Time portion of ERROR_LOG.ERROR_DATE column is lost.
 * 2- If an Oracle RAC thread reopened, it transfers archivelogs which are already in-transmit in another node.
 *
 *
 * 0.3.1d3:
 * -------------------
 * Bug:
 * 1- File name separator on standby windows is not handled correctly.
 *
 * 0.3.1d5:
 * -------------------
 * Bug:
 * 1- Recover SCN of standby database computed wrong after removing forcing archivelog generation
 *    which is introduced in ubGuard 0.3.0.
 *
 * 0.3.1d6:
 * -------------------
 * New features:
 * 1- Setting up mail.transport.user and mail.transport.password parameters are optional.
 *    SMTP authentication is forced only if both parameters are set.
 * 2- Java Mail debug is set to diagnose a problem.
 *
 * 0.3.1d7:
 * -------------------
 * Bug:
 * 1- Recovery start SCN is wrong if datafile is older than controlfile.
 *
 * 0.3.2:
 * -------------------
 * New feature:
 * 1- Unhandled exceptions are written to log/ubGuard.log.
 *
 * Bug:
 * 1- Already deleted archivedlogs are tried to be deleted again.