- code needs some refactoring but essentially seems to work

- added a few comments

- unfinished work

- added "-" to the set of possible characters in a hostname

- Added default class for layout within UnsynchronizedAppenderBase (in DefaultNestedComponentRules.java)
- 

- replaced references to LoggerContext.ROOT_NAME with references to org.slf4j.Logger.ROOT_LOGGER_NAME

- replaced references to LoggerContext.ROOT_NAME with references to org.slf4j.Logger.ROOT_LOGGER_NAME

- replaced references to LoggerContext.ROOT_NAME with references to org.slf4j.Logger.ROOT_LOGGER_NAME
- minor tweaking of LB139_Deadlocktest
- renamed TestConstants as ClassicTestConstants

- Less code duplication in rolling file tests

  be auto-started by Joran (via NestedComplexPropertyIA).

Further refactoring of TimeBasedRollingPolicy. Most of the work
related to triggering has moved into an interface called
TimedBasedFileNamingAndTriggeringPolicy. Related to LBCORE-61.

The file attribute in RollingFileAppender is honored once again. This
reverts the changes in revision 2376. Relevant tests in
TimeBasedRollingTest have been resuscitated.