Those were not really used anymore by dbsourcemanager for a while
already. However they were still compiled by various ant tasks.
Remove all of that as obsolete

- Stop calling database.lib target whereever done before
- Remove database.lib target from main build.xml file
- Remove src-db/build.xml + src used to build dbmanager.jar itself
- Remove src-db/database/lib/dbmanager.jar from .gitinore
- Above is enough to have it clean for any fresh checkout
- To cleanup older workspaces also add following to compile.complete*
  - rm src-db/build
  - rm src-db/database/lib/dbmanager.jar
    Note that was copied also to WebContent/WEB-INF/lib