Implementation of different distribution functions for velocities.

Maxwellian and Diract Delta distributions have been implemented.

The input for injection of particles should be rewritten to allow more
clear input file.

makefile

@@ -1,21 +1,26 @@
-# compiler
-FC := gfortran
-
+# set folders
 TOPDIR =  $(PWD)# top directory
 MODDIR := $(TOPDIR)/mod# module folder
 OBJDIR := $(TOPDIR)/obj# object folder
 SRCDIR := $(TOPDIR)/src# source folder
-JSONDIR := $(TOPDIR)/json-fortran-8.2.0/build
+# compiler
+# gfortran:
+FC := gfortran
+JSONDIR := $(TOPDIR)/json-fortran-8.2.0/build-gfortran
+# ifort:
+# FC := ifort
+# JSONDIR := $(TOPDIR)/json-fortran-8.2.0/build-ifort
 JSONLIB := $(JSONDIR)/lib/libjsonfortran.a
 JSONINC := $(JSONDIR)/include
 
 INCDIR :=
 INCDIR += $(JSONINC)
 
-VAR := ""
-
-# compile flags
-FCFLAGS := -fopenmp -Ofast -J $(MODDIR) -I $(INCDIR) -Wall -g
+# compiler flags
+# gfortran:
+FCFLAGS := -fopenmp -Ofast -J $(MODDIR) -I $(INCDIR) -Wall -march=native -g
+# ifort:
+# FCFLAGS := -qopenmp -Ofast -xHost -module $(MODDIR) -I $(INCDIR) -warn all -parallel -free -g
 
 #Output file
 OUTPUT = fpakc