- Fix LBCORE-74
  
  HTMLLayoutBase now takes into custom conversion words.
  
- Moved StringListAppender to c.q.l.classic.testUtil package

- cleaned up config files so that "level" is an XML attribute and not
  an XML element

- updated Gmail related examples

- LBCLASSIC-100

  Evaluators are now wired into an appender automatically (implicit
  rules) without the help of EvaluatorAction. EvaluatorAction is now
  only needed for global evaluator elements.

  It follows that name attribute is necessary only for global
  evaluators. Embedded evaluators no longer need a name.

  EvaluatorAction has been modified to accept evaluators of any type
  and not just JaninoEvaluators.

- add tests for verifying that parameter types which are concrete classes 
  can be instantiated by implicit actions
- ongoing work on evaluators

  Thus, it is no longer necessary to specify the class name as an xml attribute for sub-components
  
- refactoring of sibling appender 

- logback-access tests are now all JUnit4

 - Absorb thrown SecurityException/AccessControlException when accessing system properties
   This fixes LBCLASSIC-86

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

We now use sqljdbc4. (note the suffix 4)

  between successive runs

This should make the code a somewhat clearer

Given dependencies on test-jar logback could not be build as 'mvn package' from 
a pristine local repository. One had to 'mvn install' first. 

- doing integration tests with various databases for logback-access

- minor refactoring in DBAppender and related classes
- As suggested by John Gibson in LBCORE-15, we now use the prepareStatement method of 
  Connection which takes the sql statement followed by the autogenerateed key columnNames 
  (of type String[])

  This change is compatible with JDBC drivers of SQLServer and MySQL, as well as Oracle.

  JDBC drivers not supporting getGeneratedKeys are not affected by this change.

- added integration tests which are active only on my machine, namely, Orion. This avoids other
  developers from having to install Oracle, MySQL, Postgres and SQL Server just for the 
  logback tests to pass.
  
- similar tests on logback-access to follow.  

- detachAppender in AppenderAttachable now returns a boolean instead of an Appender.
- iteratorForAppenders() in AppenderAttachable now returns Iterator<Appender<E>> instead of just Iterator
- modified Logger to invoke callAppender without synchronization on this
- AppenderAttachableImpl modified to take advantage of the fact that reads occur much more 
  often than writes
- associated test cases

- renamed ClassPackagingDataCalculator as PackagingDataCalculator
- added calculatePackagingData method to ThrowableProxy so that converters can
  force calculation of packaging data
- added relevant test cases

- Fixes both LBCORE-27 and LBCLASSIC-67. 

- added test cases (using GreenMail) that verify that the output generated
  by SMTPAppender and HTMLLayout conform to xhtml1-strict.dtd

- HTMLLayout* now use StringBuilder instead of StringBuffer. The former is significantly faster.

Other missing files

Not not all PatternLayout instances need to have a
ThrowableInformationConverter added at the end of the converter chain
by the postCompileProcessing() method.

With this commit, post compile processing code has been moved to an
interface. By default, PatternLayouts that ship with logback have a
default post compile processor. However, it is now very easy to set
processor to null.

We now test SMTPAppender using GreenMail. Problem described in
LBCLASSIC-67 is reproduced in tests but not yet fixed.