[fix] Added a missing namespace std prefix
[upgrade] Removed use of functionality no longer available in ROOT-6

ROOT-6 doesn't provide TH1::Integral(a, b, params , ...)
[build] Made build compatible with ROOT-6 (and ROOT-5) [UNFINISHED]

New LinkDef-based dictionary generation scheme with automatic
rootmap-file generation. Uses rootcint for ROOT-5 and rootcling for
ROOT-6