Changes after review from Matt.


ChangelogDB.java:
Added removeDB().
Renamed clearDomain() to removeDomain().
In getCursorFrom(), never return a null Cursor anymore.
Updated many javadocs.



MessageHandler.java, ReplicationBackend.java:
Removed null checks for cursor (consequence of the changes to ChangelogDB)

ReplicationServerDomain.java, JEChangelogDB.java, JEReplicaDBCursor.java:
Consequence of the changes to ChangelogDB.


ReplicationServer.java:
Added removeDb().
Removed getDbDirName(), superseded in usage by removeDb().

ReplicationTestCase.java, ReplicationServerTest.java:
Consequence of the change to ReplicationServer.


DbHandler.java, ReplicationDB.java:
Renamed setCounterWindowSize() to setCounterRecordWindowSize() + updated javadoc.

DbHandlerTest.java:
Improved the tests.
Added testGetCountNoCounterRecords() to assess code behaviour.
Extracted method assertCount()

CSNGenerator.java:
Fixed ugly parameter name.

git-svn-id: https://svn.forgerock.org/opendj/trunk@9609 41b1ffd8-f28e-4786-ab96-9950f0a78031