Merge branch 'en/xdiff-cleanup-3'

Preparation of the xdiff/ codebase to work with Rust. * en/xdiff-cleanup-3: xdiff/xdl_cleanup_records: make execution of action easier to follow xdiff/xdl_cleanup_records: make setting action easier to follow xdiff/xdl_cleanup_records: make limits more clear xdiff/xdl_cleanup_records: use unambiguous types xdiff: use unambiguous types in xdl_bogo_sqrt() xdiff/xdl_cleanup_records: delete local recs pointer