reiserfs: balance_leaf refactor, move state variables into tree_balance

This patch pushes the rest of the state variables in balance_leaf into
the tree_balance structure so we can use them when we split balance_leaf
into separate functions.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Jan Kara <jack@suse.cz>

diff --cc fs/reiserfs/do_balan.c
Simple merge

diff --cc fs/reiserfs/fix_node.c
Simple merge

diff --cc fs/reiserfs/prints.c
Simple merge

diff --cc fs/reiserfs/reiserfs.h
Simple merge