Implement conservative cleanup; relates to #64
Fix cleanActionFiles()
Reproduces issue #58 (CleanupMergeDatabaseFilesScenarioTest.testIssue58_3)
println()
Merge cleanup workaround
Merge branch 'develop' into feature/conservativecleanup
Reactivate removeLostMultiChunks
Merge branch 'develop' into feature/conservativecleanup
Implement UpOperation.checkPreconditions() to simplify up
Implement nicer checkPreconditions() in DownOperation
Merge branch 'develop' into feature/conservativecleanup
Thoughts and preparations for #132 (also relates to: #58 and #64)
Remove automatic cleanup in UpOperation; manual cleanup in tests
Fix dirty database scenario test (manual cleanups)
Remove automatic cleanup in 'up', add interval-based cleanup to 'watch'
Add counter and timer for cleanup in WatchOperation
Merge branch 'feature/conservativecleanup' into develop