Apt doesn't work from `site-packages` (a.k.a. setup.py incomplete)

[maphew]

D:\>pip install --editable b:\code\apt
Obtaining file:///b:/code/apt
  Running setup.py (path:b:/code/apt\setup.py) egg_info for package from file://
/b:/code/apt

Installing collected packages: apt
  Running setup.py develop for apt
    B:\o4w\apps\Python27\lib\site-packages\setuptools-1.3.2-py2.7.egg\setuptools
\command\easy_install.py:320: UserWarning: Unbuilt egg for apt-Osgeo4w-package-m
anager [unknown version] (b:\code\apt)

    Creating b:\o4w\apps\python27\lib\site-packages\apt.egg-link (link to .)
    Adding apt 0.3 to easy-install.pth file
    Installing apt-script.py script to B:\o4w\apps\Python27\Scripts
    Installing apt.exe script to B:\o4w\apps\Python27\Scripts
    Installing apt.exe.manifest script to B:\o4w\apps\Python27\Scripts

    Installed b:\code\apt
Successfully installed apt
Cleaning up...

D:\>apt
Traceback (most recent call last):
  File "B:\o4w\apps\Python27\Scripts\apt-script.py", line 9, in <module>
    load_entry_point('apt==0.3', 'console_scripts', 'apt')()
  File "b:\code\apt\apt.py", line 1271, in main
    last_mirror = get_config('last-mirror')
  File "b:\code\apt\apt.py", line 727, in get_config
    f = os.path.join(config, fname)
NameError: global name 'config' is not defined

[maphew]

root cause is that we don't use the if __name__ == '__main__': to call a single function, so we can't have pip create an .exe in site-packages to point to it, e.g. apt:main where main is the name of the runner inside apt.py.

I tried the easy way out of just moving everything under if __name__ == '__main__': into def main() but that fails because the expected globals aren't set. So this can't be fixed until we finish moving everything into proper encapsulated functions.

(though it might be possible to get pip to create an .exe to call Scripts\apt.py?)