New Initial configuration generator.

Now uses gradient descent + zero Temperature Monte-Carlo.
Much faster, but not bugfree :)
However, it should be enough for the purpose.
Corrected 2d bug for Config Generator
Merge remote-tracking branch 'origin/master'

Conflicts:
	LF_DEM/Interaction.cpp
	LF_DEM/Interaction.h
	LF_DEM/System.cpp