Pretty straight-forward cherry-pick, plus adding the package to AnalysisBase.
Turns out the main difference were updates to copyrights, but some code changes were done as well.
List of commits involved:
- a64076b3 Fixing the package's build in standalone mode with CMake (PATInterfaces-00-00-35)
- afec45c1 Updated to PATInterfaces-00-00-38.
- c410de54 added test for SystematicSet clearing
- 9b309e93 Fixed SystematicSet clear behavior.
- a580600d boost::unordered_map --> std::unordered_map : ROOT-8890
- 54078d0b replace ISU copyright with CERN copyright
- ffdb051f make sure an empty string translates to an empty SystematicSet