root: fix XMLParse build by properly configuring our libxml2
scram-project-build: add not compiler dependency
make use of icc-scram tool to allow to usage to different icc for scram based projects
cmssw: updated for 7.0.0pre5 and do not apply cmssw-700pre4-mic patch as icc14 contains most of c++11 stuff
systemtools: use icc-scram istead of icc for scram tools to pick up tbbfrom afs
cmssw: removed python direct dependency, updated for 700pre5