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Added mock objects to test JMSTopicAppender

JMX confgurator now allows to retrieve level and effective level information for a logger passed as a parameter.
Added a doc about the jmx Configurator 

Updated access' pom.xml with dependency to javax.mail

Update DBAppenderBase and derived classes

The Appender and Layout interfaces are now generic. This is a change with wide implications in the code.

The Appender and Layout interfaces are now generic. This is a change with wide implications in the code.

Added/modified doc about LevelFilter and ThresholdFilter 

Removed call to StatusPrinter in PropertyActionTest.java

filter to allow or deny a specific given level. ThresholdFilter allows any logging events whose level is
higher or equals to its configured level.

ASF has authorized us to adapt and make use of their ICL agreement.

Added an example in mdc page

Corrected variable naming not to conflict with existing variable names
Example enumeration corrected