* Revert "Remove unused API problem filters"

* Merge branch 'stable-5.1' into stable-5.2

* Implement toString in MockSystemReader and MockConfig
* LocalDiskRefTreeDatabaseTest shall use MockSystemReader
* Ensure LocalDiskRepositoryTestCase#setup fully uses MockSystemReader
* Ensure we use MockSystemReader in tests
* Override FileBasedConfig's save method in MockConfig
* Remove FileBasedConfig.load(boolean) introduced in d45219ba
* Disable debug log for FS in org.eclipse.jgit.test

* NetscapeCookieFileTest: Split HttpCookiesMatcher to own class
* Bazel: Add missing dependency on mockito for TransportHttpTest

* GPG: check that the key found is a signing key
* GPG: use key fingerprint suffix to compare id for signing key

* SmartClientSmartServerTest: Open Repository in try-with-resource
* SmartClientSmartServerTest: Open ObjectInserter.Formatter in try-with-resource
* SmartClientSmartServerTest#addBrokenContext: Remove unused TestRepository
* IO: Open TemporaryBuffer.Heap in try-with-resource
* GitSmartHttpTools: Open SideBandOutputStream in try-with-resource
* TemporaryBufferTest: Open TemporaryBuffer in try-with-resource
* Scanner: Open RevWalk in try-with-resource
* SubmoduleWalkTest: Open Repository in try-with-resource
* SideBandOutputStreamTest: Open SideBandOutputStream in try-with-resource
* UnionInputStreamTest: Open UnionInputStream in try-with-resource
* Merge: Avoid non-localised literal string warning for "recursive"

* Override int read(byte[], int, int) on test instances of InputStream
* LfsFactory#LfsInputStream: Override int read(byte[], int, int)

* Fetch(Process): should tolerate duplicate refspecs

* Remove deprecated StoredObjectRepresentationnotAvailableException ctor
* Remove deprecated ArchiveCommand#putEntry method

* LongObjectIdTest: Open OutputStreamWriter in try-with-resource

* FS: Open TemporaryBuffer in try-with-resource
* EditListTest: Open InputStream in try-with-resource
* EGitPatchHistoryTest: Open BufferedReader in try-with-resource
* T0003_BasicTest: Use CommitBuilder.setEncoding(Charset)
* WalkEncryptionTest: Use StandardCharsets.UTF_8
* GetTextTest: Use StandardCharsets constants instead of CharSet.forName
* EGitPatchHistoryTest: Set input stream encoding with constant
* DirCacheIterator: Open InputStream in try-with-resource
* DumbClientSmartServerTest: Open auto-closeable resources in try-with-resource
* DirCacheCheckoutTest: Open FileInputStream in try-with-resource
* DiffFormatterReflowTest: Open InputStream in try-with-resource

* Require maven 3.5.2
* Update japicmp-maven-plugin to 0.11.0

* Merge branch 'stable-4.9'

* Use a new RevWalk for validating not advertised wants

* ObjectToPack: Add missing @Override annotation

* IntList: support contains(int)

* Improve BatchRefUpdateTest readability
* Move BatchRefUpdate tests to a new file
* Implement atomic BatchRefUpdates for RefDirectory
* Separate RefUpdate.Result.REJECTED_{MISSING_OBJECT,OTHER_REASON}

* Replace usage of deprecated EWAHCompressedBitmap.add(long)

* Switch JSchSession to simple isolated OutputStream

* [findBugs] Prevent potential NPE in CloneCommand.init()

* GC should not pack objects only referenced by ORIG_HEAD,...

* Avoid repeated sort of tipCommitBitmaps

* Add missing javadoc @param for new method setObjectCountCallback()

* Merge branch 'stable-3.7'

* TestRepository: Allow custom author/committer per-commit
* TestRepository: Use try-with-resources where appropriate

* Add missing javadoc for archive code
* Remove unused import in Archive
* Drop unnecessary "throws" clauses in archive code
* Move FormatActivator.start()/stop() to a separate class

* Merge branch 'stable-3.0'

* Remove DFS locality ordering during packing

* Indicate initial commit on a branch in the reflog

* Merge branch 'stable-2.0'

* Add exception class for when locking a file fails

* Add varargs version of PathFilterGroup.createFromStrings

* Refactor out ReflogEntry