* Merge branch 'stable-5.7' into stable-5.8

* Upgrade maven-site-plugin to 3.9.1
* Upgrade build-helper-maven-plugin to 3.2.0
* Upgrade spotbugs to 4.0.4

* Prepare 5.8.0-SNAPSHOT builds

* Add ability to redirect stderr from git hooks
* Add possibility to get pure stderr output from AbortedByHookException

* Silence API errors for new fields added to PackStatistics.Accumulator

* Fix FileAttributeCache.toString()

* PostUploadHookChain: Use a list instead of array internally

* Merge branch 'stable-5.4'

* 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"

* Prepare 5.1.5-SNAPSHOT builds

* Use a TreeMap to construct the list of renamed projects

* Retry stale file handles on .git/config file

* FileSnapshotTest: Open FileOutputStream in try-with-resource
* FileSender: Open OutputStream in try-with-resource
* FileRepository: Open FileInputStream in try-with-resource
* FileLfsServlet: Open PrintWriter in try-with-resource
* FetchProcess: Open OutputStreamWriter in try-with-resource

* Fix javadoc in org.eclipse.jgit hooks package
* Fix javadoc in org.eclipse.jgit gitrepo package
* Fix javadoc in org.eclipse.jgit fnmatch package

* dfs: write reftable from DfsGarbageCollector
* dfs: compact reftables during DfsPackCompactor

* Update minimum JDK version in README

* Upgrade jacoco-maven-plugin to 0.7.9
* Upgrade maven-build-helper-plugin to 3.0.0
* Upgrade maven-shade-plugin to 3.0.0
* Fix inconsistent versioning of findbugs-maven-plugin
* Upgrade maven-compiler-plugin to 3.6.1

* Add missing @since tag for new protected field in ObjectReader

* CheckoutCommandTest: Create Git instances in try-with-resource
* BranchCommandTest: Create Git instances in try-with-resource
* CheckoutTest: Create Git instances in try-with-resource
* BranchTest: Create Git instances in try-with-resource
* URIishTest: Use @Test annotation's `expected` argument
* Suppress "The allocated object is never used" warning in tests
* Add $NON-NLS to suppress "Non-externalized string literal" warnings
* Don't use deprecated constructors of CmdLineException

* Delete deprecated TemporaryBuffer.LocalFile constructors
* Delete deprecated FileUtils.setExecute(File, boolean)
* Delete deprecated WorkingTreeIterator.isModified(DirCacheEntry, boolean)
* Delete deprecated UploadPackMayNotContinueException
* Delete deprecated TransferConfig.isFsckObjects()
* Delete deprecated TextBuiltin.out
* Delete deprecated Merger.getBaseCommit()

* Revert "Let ObjectWalk.markUninteresting also mark the root tree as"

* Honor git-core meaning of receive.denyDeletes allowing tag deletion

* HistogramDiff: Convert stack recursion to heap managed queue

* Fix MissingObjectException race in ObjectDirectory

* Fix compilation error due to missing javadoc.

* [blame] Reset rename detector before computing renames.

* PackIndex: Support reading from any InputStream
* Make PackReverseIndex a public structure
* Add String form of PackInvalidException constructor
* Make lookup methods on PackIndex public