Merge pull request #919 from smuzaffar/IB/CMSSW_7_2_X/stable

integrated new scram and config tag
Revert versions of autoconf and automake which broke lhapdf compilation.
Merge pull request #920 from cms-sw/downgrade_autoconf_71X

Revert versions of autoconf and automake which broke lhapdf compilation.
Merge remote branch 'origin/IB/CMSSW_7_1_X/stable' into IB/CMSSW_7_0_X/stable
Re-enable xrootd 4.0.2.

- Update to xrootd 4.0.2
- Patch cmake to keep  XrdClientProtocol.hh XrdClientSid.hh headers as private headers
- Include private headers in default headers location
- Purge old and unused patches.
Merge pull request #922 from degano/re-enable_xrootd402_72X

Re-enable xrootd 4.0.2.
SCRAM version updated
new config tag V05-03-15
Merge pull request #923 from smuzaffar/IB/CMSSW_7_1_X/stable

new scram and config tag
Merge remote-tracking branch 'origin/IB/CMSSW_7_1_X/stable' into IB/CMSSW_7_0_X/stable
from 53X: added support for default compiler and extra tools
Merge pull request #924 from smuzaffar/IB/CMSSW_7_0_X/stable

from 53X: added support for default compiler and extra tools
Merge remote-tracking branch 'origin/IB/CMSSW_7_0_X/stable' into IB/CMSSW_7_0_X/stable
Merge remote-tracking branch 'origin/IB/CMSSW_7_1_X/stable' into IB/CMSSW_7_0_X/stable
added the mic macro which are not automatically merged by jekin job
Merge pull request #925 from smuzaffar/IB/CMSSW_7_1_X/stable

added the mic macro which are not automatically merged by jekin job
Merge remote-tracking branch 'origin/IB/CMSSW_7_1_X/stable' into IB/CMSSW_7_0_X/stable
updatyed cmssw and cmssw-patch to make use of scram_compiler and extra_tools fro clang and icc builds