test_hetrodyne_pulsar.sh fails due to hardcoded python interpreter

The make_frame_cache script has /usr/bin/python hardcoded as the intrepreter, on various systems there is no /usr/bin/python available (for example on a platform were all dependencies are installed with Conda) so this test fails with:

./test_heterodyne_pulsar.sh: ./make_frame_cache: /usr/bin/python: bad interpreter: No such file or directory
Could not create the cache file!
FAIL test_heterodyne_pulsar.sh (exit status: 2)

If I replace this the interpreter with #!/usr/bin/env python then the script fails due to some Python3 incompatibilities in the script:

FAIL: test_heterodyne_pulsar.sh
===============================

  File "./make_frame_cache", line 70
    except Exception, e:
                    ^
SyntaxError: invalid syntax

Can these incompatibilities be fixed and the correct interpreter used.