Add possibility to build python bindings. If choosen check if all needed python dependencies are installed.

First version of the external packages with possibility to build the python bindings for geant4 and root.

Patch to fix downcasts which results in errors when using Clang with c++11.

Add possibility to build python bindings. If choosen check if all needed python dependencies are installed.

Rebase done.

First version which creates g4py on Mac OSX 10.9.

Fix build and installation directory.

Correct checkfile and names.

Export environment variable SIMPATH_INSTALL which is needed later on in some CMake scripts. The export was done up to now only for the automtic setting, but not for the menu.

Add additional flag which was requested by Thomas to also build the G4GDMLParser for FairShip. The flag is set when building the python bindings which is in the moment only done by FairShip.
More fixes for g4py requested by Thomas.
Move build of XercesC before build of Geant4, due it is needed for the build process of G4 gdml which is needed for FairShip.
Build Boost with toolset clang independent of platform.
Compilation with clang and libc++ works now also on linux. There are still some libraries which have a dependency to libstdc++. This has to be solved properly.
Create more packages to get rid of libstdc++ dependencies.
Fix problem with Root VMC Makefiles used by geant3 and geant4_vmc. Now the files are compiled with libc++ and c++11 when compiling with Clang on Linux.
Add missing include statement when compiling zeromq woth Clang on Linux.
Add gitignore file which contains all downloaded files and created directories.
Better error message.
No default compiler for automatic setting. If not set the script will stop during system check. Comment install_mesa package for the time beeing.
Switch of non system path for OpenGL.
Patch to have correct path to libc++ in the Geant4 librariws when compiling on linux using clang.
New package which is needed to remove dependencies to stdc++ when compiling on linux using clang.
When compiling on linux using clang use the icu library from our installation.
Add more files to ignore.
Fix bug in if statement.