minor "scons install" stuff
minor "scons install" stuff

Remove shebang and executable bit from generate.py. It's only used
for compilation; this is just to hide them from the evil eyes of the
distribution tools ;-)

https://gna.org/bugs/index.php?19181

achadwick/libmypaint,achadwick/libmypaint,achadwick/libmypaint,b3sigma/libmypaint,achadwick/libmypaint,b3sigma/libmypaint,b3sigma/libmypaint