* Suppress API error for RefDatabase.hasFastTipsWithSha1()
* Remove API filters which became obsolete after bumping version to 5.7.0
* Add missing @since tag for ReceivePack#receiveWithExceptionPropagation
* Prepare 5.7.0-SNAPSHOT builds
* Merge branch 'stable-5.6'
* Fix NPE in RebaseTodoFile#parseComments
* Fix NPE in ObjectIdOwnerMap#get
* Fix NPE in CommitOnlyTest#getHead
* FileUtils#lastModifiedInstant should not log error if path doesn't exist
* Cache user global and system-wide git configurations
* Avoid setup and saving FileStoreAttributes compete for ~/.gitconfig lock