correcting brownian stress
Merge remote-tracking branch 'refs/remotes/origin/master'
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Removing now obsolete BrowninaForce class
Introduced resistance_matrix_dblock in the system class to initialize the resistance matrix.
Corrected bug in Brownian forces
Merge remote-tracking branch 'refs/remotes/origin/master'

Conflicts:
	LF_DEM/StokesSolver.cpp
	LF_DEM/System.cpp
	LF_DEM/System.h
Default value for sd_coeff.
Merge remote-tracking branch 'refs/remotes/origin/master'

Conflicts:
	LF_DEM/System.h
Fixed a bug (boxset.update was missing in generateInitConfig.
Modified Xcode configuration (linking libraries).