updated Rcpp number mismatch warning

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/mzR@79172 bc3139a8-67e5-0310-9ffc-ced21a209358
Fix a compile error with the clang-3.3 compiler

git-svn-id: https://hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/mzR@79183 bc3139a8-67e5-0310-9ffc-ced21a209358
merged svn