* Upgrade ecj to 3.22.0

* Remove duplicate copyright statements
* Update EDL 1.0 license headers to new short SPDX compliant format

* ReftableTest: Clean up boxing warnings on usage of String.format
* MergedReftable: Remove unnecessary semicolon

* Ignore warning that tests don't export all packages
* Ensure all packages are exported
* Delete unused API problem filters
* Walk tag chains for --include-tag options

* JGit v5.1.8.201906050907-r
* Test detecting modified packfiles
* Enhance fsTick() to use filesystem timer resolution
* Add debug trace to measure time needed to open pack index

* Merge branch 'stable-4.6' into stable-4.7

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

* RefDirectory: Do not use search path to find additional refs

* FileRepositoryBuilderTest: Don't explicitly close BufferedWriter in try-with-resource
* Explicitly specify charset when constructing FileWriter
* Explicitly specify charset when constructing BufferedReader
* Explicitly specify charset in constructor of InputStreamReader
* Explicitly specify charset when calling getBytes
* Explicitly specify charset in constructor of String
* Make inner classes static where possible
* Bazel: Increase severity of ExpectedExceptionChecker to ERROR

* Merge branch 'stable-4.7' into stable-4.8

* TarFormat: Use commit time as timestamp for entries

* 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

* Organize imports

* Remove BitmapRevFilter.getCountOfLoadedCommits
* Make BitmapBuilder.getBitmapIndex public
* Deprecate BitmapBuilder.add and introduce simpler addObject method
* Add @Override annotations to BitmapIndexImpl
* Rely on bitmap RevFilter to filter walk during bitmap selection
* Use 'reused' bitmap to filter walk during bitmap selection
* Rely on bitmap RevFilter to filter tip commit setup walk
* Use 'reused' bitmap to filter tip commit setup walk
* Include ancestors of reused bitmap commits in reuse bitmap again

* JGit v3.6.0.201412230720-r

* Support DfsRepository from GarbageCollectCommand

* Remove cached_packs support in favor of bitmaps
* Remove objects before optimization from DfsGarbageCollector
* Simplfy caching of DfsPackDescription from PackWriter.Statistics

* Fix PlotCommit for commits with duplicate parents

* Ensure the ObjectInserter flushes after a merge