[Exp PyROOT] Unset variables before looking for Python
[Exp PyROOT] Unset variables before looking for Python

The following CMake variables:
PYTHON_INCLUDE_DIR
PYTHON_LIBRARY
are unset in order to allow the use to specify only -DPYTHON_EXECUTABLE
at configure time.

The following variable:
CMAKE_INSTALL_PYROOTIR
is unset in order to install the package in the correct path.

karies/root,karies/root,root-mirror/root,olifre/root,olifre/root,karies/root,root-mirror/root,root-mirror/root,root-mirror/root,root-mirror/root,karies/root,olifre/root,olifre/root,olifre/root,karies/root,olifre/root,olifre/root,root-mirror/root,karies/root,olifre/root,karies/root,olifre/root,root-mirror/root,olifre/root,root-mirror/root,olifre/root,root-mirror/root,karies/root,root-mirror/root,karies/root,karies/root,karies/root,root-mirror/root