Modify TTree::SetBasketSize and SetBranchStatus to take into account branch names

with dimensions like ring[48]. Branch names containing [] were omitted
due to the special meaning of these characters in teh regular expressions.


git-svn-id: http://root.cern.ch/svn/root/trunk@53 27541ba8-7e3a-0410-8455-c3a389f83636