bunsan_find_python() implementation.

bunsan_find_python1()
bunsan_find_python2()
bunsan_find_python3()
bunsan_find_python_minimum()
bunsan_find_python1_minimum()
bunsan_find_python2_minimum()
bunsan_find_python3_minimum()

bunsan_use_python_libs() refactoring.
bunsan_install_python_module_common() refactoring.
bunsan_install_python_module_compile() implementation.