fixes for patch release: follow symlinks under src tree too to find the classes.h files; search for all .edmplugincache files in LD_LIBRARY_PATH; fix lostDefs for l1t::CaloTower
Merge pull request #4032 from smuzaffar/CMSSW_7_0_X

fixed duplicateReflexLibrarySearch for patch releases
Merge remote branch 'origin/CMSSW_7_0_X' into CMSSW_7_0_X