use cmspm from pkgtoools instead of cmsdist; make use of cms-sparse-checkout to get sources for patch releases
bug fix: do git cms-addpkg FWCore/Version releasename instead of baserelease
fixed patch release sources bug; make all -toolfile as BuildRequires so that we do not ship more than 100 -toolfile rpms
scheduler.py: do not add duplicate jobs
cmsBuild: fix for -toolfile requires to buildrequire; parallel download of rpm from server
sync with V00-21 branch