python: update examples and docs

python/examples/ipython/mpi4py/hello.py

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+from mpi4py import MPI
+
+comm=MPI.COMM_WORLD
+print("Hello from rank %d of %d" % (comm.rank, comm.size))

python/examples/ipython/mpi4py/in.melt

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+# 3d Lennard-Jones melt
+
+units		lj
+atom_style	atomic
+
+lattice		fcc 0.8442
+region		box block 0 10 0 10 0 10
+create_box	1 box
+create_atoms	1 box
+mass		1 1.0
+
+velocity	all create 3.0 87287
+
+pair_style	lj/cut 2.5
+pair_coeff	1 1 1.0 1.0 2.5
+
+neighbor	0.3 bin
+neigh_modify	every 20 delay 0 check no
+
+fix		1 all nve
+
+#dump		id all atom 50 dump.melt
+
+#dump		2 all image 25 image.*.jpg type type &
+#		axes yes 0.8 0.02 view 60 -30
+#dump_modify	2 pad 3
+
+#dump		3 all movie 25 movie.mpg type type &
+#		axes yes 0.8 0.02 view 60 -30
+#dump_modify	3 pad 3
+
+thermo		50
+run		250

python/examples/ipython/mpi4py/melt.py

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+from mpi4py import MPI
+from lammps import lammps
+
+L = lammps()
+L.file('in.melt')
+
+
+if MPI.COMM_WORLD.rank == 0:
+    pe = L.get_thermo("pe")
+    print("Potential Energy:", pe)