Remove CVS info from git.
Merge pull request #3 from richard-cms/HIBackgroundSubtraction

Remove CVS info from git.
Add virtual destructor
Manually cast types passed to std::max

In CMSSW 6 gcc the arguments to std::max can't
be coerced to the same type.  Generates really gnarly
compiler errors.
Add direct HDFS access, xrootd is messed up today.