[bug fix] LogManager -> LoggingManager
create setting class and main class for detecting target revisions
make RepositoryManagerManager to have multiple repository managers
add some fields in RepositoryManagerManager
change SVNTargetRevisionDetector and related classes to fit the new scheme of db
create a thread class for detecting target revisions
create a class to monitor RevisionDetectThread
implement a function to detect target revisions
modify the property file of log4j
add retrievers and registerers for combined elements