Move to python 2.7.6.
modified for CMSSW_7_2_X and Sherpa 2.1.1
Merge pull request #834 from ktf/backport-sherpa-and-python2.7.6

Backport sherpa and python2.7.6
Add plain glibc 2.12.2 + TLS/thread-safety patch dynamic loader

The following contains plain glibc 2.12.2 with TLS/thread-safety patch
on top. All the changes are contained within the dynamic loader, thus
package only includes only ld-2.12.2.so. ABI and API is not modified.

SCRAM tool file makes GLIBC_ROOT available in developer area for wrapper
scripts.
Merge pull request #835 from ktf/include-fixed-glibc

Add plain glibc 2.12.2 + TLS/thread-safety patch dynamic loader
Rename LHAPDF6 libraries and python modules.
Merge pull request #836 from ktf/fix-lhapdf6

Rename LHAPDF6 libraries and python modules.
Merge remote branch 'origin/IB/CMSSW_7_1_X/stable' into IB/CMSSW_7_0_X/stable
Merge remote branch 'origin/IB/CMSSW_7_2_X/stable' into IB/CMSSW_7_0_X/stable