On the fsfs-pack branch: Further flesh out the packing abilities of FSFS.
On the fsfs-pack branch:
Further flesh out the packing abilities of FSFS.

* subversion/libsvn_fs_fs/fs_fs.c
  (pack_shard): New stub.
  (svn_fs_fs__pack): Figure out which shards are complete, and attempt to
    pack them.


git-svn-id: 6d1e534e20247d472effbf726af644f7d9a7221d@873741 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion