Merge branch 'stable-6.7'

* stable-6.7:
  PackConfig: fix @since tags
  Remove unused API problem filters
  Add support for git config repack.packKeptObjects
  Do not exclude objects in locked packs from bitmap processing

Change-Id: I7e0856a5d70d5d155cf6874383ea1f5622d5238a

diff --cc Documentation/config-options.md
Simple merge

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java
Simple merge