use more portable shebang line in python scripts

python/examples/demo.py

@@ -1,4 +1,4 @@
-#!/usr/local/bin/python -i
+#!/usr/bin/env python -i
 # preceeding line should have path for Python on your machine
 
 # demo.py

python/examples/gui.py

@@ -1,4 +1,4 @@
-#!/usr/local/bin/python -i
+#!/usr/bin/env python -i
 # preceeding line should have path for Python on your machine
 
 # gui.py

python/examples/plot.py

@@ -1,4 +1,4 @@
-#!/usr/local/bin/python -i
+#!/usr/bin/env python -i
 # preceeding line should have path for Python on your machine
 
 # plot.py

python/examples/simple.py

@@ -1,4 +1,4 @@
-#!/usr/local/bin/python -i
+#!/usr/bin/env python -i
 # preceeding line should have path for Python on your machine
 
 # simple.py

python/examples/trivial.py

@@ -1,4 +1,4 @@
-#!/usr/local/bin/python -i
+#!/usr/bin/env python -i
 # preceeding line should have path for Python on your machine
 
 # trivial.py

python/examples/viz_atomeye.py

@@ -1,4 +1,4 @@
-#!/usr/local/bin/python -i
+#!/usr/bin/env python -i
 # preceeding line should have path for Python on your machine
 
 # viz_atomeye.py

python/examples/viz_gl.py

@@ -1,4 +1,4 @@
-#!/usr/local/bin/python -i
+#!/usr/bin/env python -i
 # preceeding line should have path for Python on your machine
 
 # viz_gl.py

python/examples/viz_pymol.py

@@ -1,4 +1,4 @@
-#!/usr/local/bin/python -i
+#!/usr/bin/env python -i
 # preceeding line should have path for Python on your machine
 
 # viz_pymol.py

python/examples/viz_vmd.py

@@ -1,4 +1,4 @@
-#!/usr/local/bin/python -i
+#!/usr/bin/env python -i
 # preceeding line should have path for Python on your machine
 
 # viz_vmd.py

python/examples/vizplotgui_atomeye.py

@@ -1,4 +1,4 @@
-#!/usr/local/bin/python -i
+#!/usr/bin/env python -i
 # preceeding line should have path for Python on your machine
 
 # vizplotgui_atomeye.py

python/examples/vizplotgui_gl.py

@@ -1,4 +1,4 @@
-#!/usr/local/bin/python -i
+#!/usr/bin/env python -i
 # preceeding line should have path for Python on your machine
 
 # vizplotgui_gl.py

python/examples/vizplotgui_pymol.py

@@ -1,4 +1,4 @@
-#!/usr/local/bin/python -i
+#!/usr/bin/env python -i
 # preceeding line should have path for Python on your machine
 
 # vizplotgui_pymol.py

python/examples/vizplotgui_vmd.py

@@ -1,4 +1,4 @@
-#!/usr/local/bin/python -i
+#!/usr/bin/env python -i
 # preceeding line should have path for Python on your machine
 
 # vizplotgui_vmd.py

python/install.py

@@ -1,4 +1,4 @@
-#!/usr/local/bin/python
+#!/usr/bin/env python
 
 # copy LAMMPS src/liblammps.so and lammps.py to system dirs