Updated strain softening module to avoid name conflict

src/Makefile

@@ -11,7 +11,7 @@ module_definitions.o \
 module_random.o \
 module_colormap.o \
 module_version.o \
-module_ss.o \
+module_strain_soften.o \
 DoRuRe.o \
 build_surface_octree.o \
 build_system_wsmp.o \

src/vrm.f90

@@ -24,6 +24,7 @@ subroutine vrm (params,J2d,J3d,compressibility,viscosity,pressure,             &
 use constants
 use definitions
 use invariants
+use strain_soften
 
 !------------------------------------------------------------------------------|
 !(((((((((((((((( Purpose of the routine  ))))))))))))))))))))))))))))))))))))))