* 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.