Python scripts use hardcoded #!/usr/bin/python instead of #!/usr/bin/env python
The hardcoding of /usr/bin/python makes it overly difficult to point the build to another python installation.
There is also one script, scripts/make_gromos_rtp.py, that has #!/usr/freeware/bin/python
Would be nice to have that fixed. Will also make it easier to migrate to using Python3.
Use more portable python shebangs
Per https://www.python.org/dev/peps/pep-0394/#recommendation, we
should use env, and point it at python2. When we either make them 2/3
or just-3 compatible, this should change.
Some distros (notable Arch Linux) already point python at python3 so
we should choose to be explicit, and thus somewhat portable.