Now checking if a mbean is already registered under the same ObjectName to prevent an javax.management.InstanceAlreadyExistsException when reloading the access configuration

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One dialect only for now.

added a testcase to PackageTest.java

Work in progress

- don't crash the server in case  JoranConfiguration throws an exception

- Print stack trace in case of parsing problems of the joran config file
- RequestLogRegistry instead of RequestLogMapper
- print Status list only in case of errors or warnings

Moved to core module the common functionnalities
Minor modifications on the other classes (format,...)

Added a trick in OptionHelper to load classes 

Added filter support

Updated test case
Minor javadoc modifications to TimeBasedRollingTest