First version with possibility for charged particles to be included.

Now, the solver needs to be an input parameter of the case, to select if
it is for charged or neutral particles.

Resolution of Poisson equation with Dirichlet boundary conditions is
possible. The source vector is the charge density. This resolution is
done in two steps to save computational time:
  1. When reading the mesh, the PLU factorization of the K matrix is
  computed.
  2. In each iteration, the system K*u = f is solved, in which f is the
  source vector (charge density) and u is the solution (potential) in
  each node.

No case has been added to the repository. This will be done in next
commit.

The 'non-analog' scheme has been commented. It still needs to split
the particle to avoid 'overweight' particles.

makefile

@@ -12,20 +12,24 @@ JSONINC := $(JSONDIR)/include
 INCDIR := 
 INCDIR += $(JSONINC)
 
+VAR := ""
+
 # compile flags
-FCFLAGS := -fopenmp -Ofast -J $(MODDIR) -I $(INCDIR) -Wall -fno-stack-arrays -g
+FCFLAGS := -fopenmp -Ofast -J $(MODDIR) -I $(INCDIR) -Wall -g
 
 #Output file
-OUTPUT = DSMC_Neutrals
+OUTPUT = PPartiC
 
 export
 
-$(OUTPUT): src.o 
+all: $(OUTPUT)
+
+$(OUTPUT):  src.o 
 
 src.o:
 	@mkdir -p $(MODDIR)
 	@mkdir -p $(OBJDIR)
-	$(MAKE) -C src all
+	$(MAKE) -C src $(OUTPUT)
 
 clean:
 	rm -f $(OUTPUT)