(WIP) Store uid and gid in the database, instead of names.

That replaces the owner and gr_name attributes with uid and gid.

TODO: request with wildcards in username or group names are not
supported.
New rbh-find output to display stat info.

Added the -lsstat command line option. Each file is output like:
 [file,31532,12790,23,1365022640,1365022640,1365022640]=/mnt/lustre/foo

Format is [type, uid, gid, size, ctime, mtime, atime]=file name
Added -lsost to list every file's OSTs.
Fixed typos.