Merge pull request #21 from smuzaffar/master

drop use of UNIVERSAL::isa and replaces it with ref()
biglib only contains plugins so no need to have it in LIBDIR i.e. no -Lbiglib needed
Merge branch 'master' of github.com:cms-sw/cmssw-config
do not link biglink until all its dependencies are built; make sure the logs of biglib are also available in IB
makesure that proper DirCche.mk file is updated: This fixes the issue that changing plugins/BuildFile.xml does not pick up changes of plugins/BuildFile.xml
added check_dependents_<BigLib> rule to show if any any package depends on biglib due to their dependency on small libs
changelog updated for V05-03-14
For now, disable biglib rules for llvm
for unittests rule always call unittests of PRE_TEST instead of runtests