calculate(IThrowableProxy), as expected, needs to support suppressed Throwables, too.

All of this has been tested with Java 7 b145 and is working as expected.

See http://www.oracle.com/technetwork/articles/java/trywithresources-401775.html

- Removed superfluous public from methods in IThrowableProxy interface and added method IThrowableProxy[] getSuppressed().
- Serialized ThrowableProxyVO will be incompatible since suppressed has been added. Consequently, the respective serialVersionUID has been changed.
- ThrowableProxyVO.equals is now also checking suppressed.
- ThrowableProxy is now evaluating suppressed Throwables of its c'tor argument if the Throwable class has a getSuppressed() method, i.e. in case of Java SE 7 and upwards.

This patch is merely adding support of suppressed exceptions to the creation of LoggingEvent/IThrowableProxy. Further support should be added to the following classes:

- ch.qos.logback.classic.db.DBAppender
- ch.qos.logback.classic.html.DefaultThrowableRenderer
- ch.qos.logback.classic.net.SyslogAppender
- ch.qos.logback.classic.pattern.ThrowableProxyConverter
- ch.qos.logback.classic.spi.ThrowableProxyUtil
  - method asString
- ch.qos.logback.classic.spi.PackagingDataCalculator
  - method calculate(IThrowableProxy tp) may also need to take suppressed into account.

The example was already correct.

  1) moved SizeAndTimeBasedFNATP_Test.java to SizeAndTimeBasedFNATP_STest.scala
  2) made sure that SizeAndTimeBased rolling creates the correct zip entry for zip files

- attempting to make pom.xml files be compatible with Scala IDE

Fixed LBCORE-199 by adding a timestamp to the entry found in the zip file. This was suggested by Benoit Xhenseval.

ATTENTION, breaking change:
- removed NA_STRING_ARRAY because the content could
have been changed by other classes, previously.
- EMPTY is no longer public but private instead.

- avoid clearing the old map reference which may be still referenced elsewhere