run on older JDKs we make JDK 1.6 a requirement for running the DBAppenderIntegration tests. 

We now use sqljdbc4. (note the suffix 4)

loop len of 10'000 is already pretty long

Related to LBCLASSIC-54

Mopping up refactoring of turbo filters

 	 
- Heavy refactoring of TurboFilters 
  TurboFilters are now collected in a CopyOnWriteArrayList which is
  ensures safe access even if the turbo filter list is modified during
  the lifetime of the application
  
  Added test cases to ensure that performance does not degrade in an
  uncontrolled fashion
  
  More cleaning up to follow

  between successive runs

- added a performance test on LoggingEvent serialization

Lazy initialization of formattedMessage as suggested in LBCLASSIC-47

Fixes LBCLASSIC-49

The getLogger() method in LoggerContext class will now throw an
IllegalArgumentException when invoked with a null argument.
  

- fixed LBCORE-21, 

  TimeBasedRollingPolicy will now check at initialization time
  to see if an existing target file needs to be rolled over
  
- further refactoring of TimebasedRollingPolicyTest

The writer field in WriterAppender has been marked as private, as suggested by Anders Hammar in LBCORE-34

Making BasicStatusManager more sub-class friendly

Added a setter for the StatusManager.

- copyright notices

- documentation on status listeners

- added copyright notice

Setting a message size limit of 256K.

LevelToSyslogSeverity.convert method did not cover the TRACE level.

This should make the code a somewhat clearer