cmfs-tools: clean debugfs.cmfs/debugfs.cmfs in clean-all.sh
cmfs-tools: bug fix for debugfs.cmfs 'stats' command

This patch fixes 3 bugs, then stats command in debugfs.cmfs works,
1, in do_open(), set superblock to CMFS_SUPER_BLOCK_BLKNO, set
block_size to CMFS_MIN_BLOCKSIZE.
2, in dump_inode, remove dyn_features, because current this variable is
not initialized and used, the code introduces a SIGSEG fault.
3, in open_pager, fix a type (replace "__non__" by "__none__"), and
specify more(1) path as "/bin/more"

Now stat command works in debugfs.cmfs.