Remove executable flag of bpython/cli.py.
Remove executable flag of bpython/cli.py.

Either start bpython with "python -m bpython.cli" or using a start
script, but not using "python bpython/cli.py" as that adds bpython's
package directory to sys.path, which is rather bad.

kdart/bpython,wevial/bpython,aktorion/bpython,kdart/bpython,wevial/bpython,aktorion/bpython