Add support for python code and update the makefile in sinolpack
such that the bang python is added to the top of python code submission
and mode changed to executable to make it run as shown below:

%.e: %.py
    echo "#!/bin/env python" > $*.e
    cat $^ >> $*.e
    chmod 755 $*.e

The is an alternate implementation which utilizes pyinstaller python
package, but it generate at least 4MB+ of binary every time (even for
small python code), so I dont like it too much.

Sample changes (not in this commit but just for keeping a record).

%.e: %.py
    pyinstaller --noconfirm --onefile --nowindow --name=$*.e $^
    -mv dist/$*.e .
    -rm -rf dist
    -rm -rf build
    -rm *.spec