Improve python2 support.

install.py

@@ -1,4 +1,6 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
+from __future__ import print_function
+
 import mtanalyze.minetestinfo
 print("This doesn't work (not yet implemented)")
 # https://github.com/poikilos/homedecor_ua

mtsenliven.py

@@ -1,4 +1,5 @@
-#!/usr/bin/env python3
+#!/usr/bin/env python
+from __future__ import print_function
 
 # runs minetestserver using the paths defined by minetestinfo
 # NOTE: SIGINT (as opposed to KILL) makes sure minetest server