* [releng] japicmp: update last release version

* UploadPack: Use more relevant refs first in object reachability check
* UploadPack: Refactor to generalize the object reachability checks
* UploadPack: Use BitmappedReachabilityChecker for not advertised wants
* revwalk: Introduce bitmap-based object reachability checker
* revwalk: Extract ObjectReachabilityChecker interface
* UploadPack: Extract walk-based reachability check

* server: Add a custom error handler
* transport: Add methods that do not handle exceptions
* transport: Let users specify an error handler for unpacking a pack file
* ReceivePack: Use try-with-resources for PostReceiveHook
* transport: Consolidate status reporting code
* transport: Add ReceiveCommandErrorHandler
* transport: Move exception handler to the caller
* transport: Move handling code to the caller side

* Upgrade maven-jar-plugin to 3.2.0
* Upgrade maven-source-plugin to 3.2.0

* [errorprone] Add parenthesis to clarify operator precedence

* Merge branch 'stable-4.10' into stable-4.11

* Fix atomic lock file creation on NFS
* Use constant for ".lock"

* Merge branch 'stable-4.11' into stable-5.0

* Prepare 4.10.0-SNAPSHOT builds

* Run auto GC in the background

* Merge branch 'stable-4.6'

* FileTreeIteratorTest: Open Git and RevWalk in try-with-resource
* RebaseCommandTest: Open RevWalk in try-with-resource
* PullCommandTest: Open RevWalk in try-with-resource
* BlameGeneratorTest: Create Git instances in try-with-resource
* Remove unnecessary suppression of deprecation warnings in tests
* DiffEntryTest: Open Git and TreeWalk in try-with-resource
* DiffCommandTest: Open Git and RevWalk in try-with-resource
* CommitCommandTest: Open Git and TreeWalk in try-with-resource

* Transport: Implement AutoCloseable

* Changed default log4j log level from "WARNING" to "WARN"

* Add a grace period for packfiles during GC

* CommitBuilder should check for duplicate parents

* PackIndexV2 should check for possible corruption

* Prepare 3.1.0-SNAPSHOT builds

* Update build to Tycho 0.17

* README: Convert to Markdown and rename to README.md

* Enhance statistics for repo by sizes and ref-counts

* Cosmetic adjustment of relative date format, do not display "0 months"
* Make use of the many date formatting options in the log command
* Define a utility class for handling Git date formats

* Extend IndexDiff to calculate ignored files and folders