CMSSW_7_4_10_patch1

Changes since CMSSW_7_4_10:

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1. 10864 from @bbockelm: Fix sigstack printer. core created: 2015-08-19 21:50:45 merged: 2015-08-20 05:46:15

2. 10867 from @jhgoh: Fix crash due to invalid track status reconstruction created: 2015-08-20 00:56:05 merged: 2015-08-20 05:41:22

CMSDIST Changes between Tags REL/CMSSW_7_4_10/slc6_amd64_gcc491 and REL/CMSSW_7_4_10_patch1/slc6_amd64_gcc491:

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