Clean setup.py for easier installation

[jnothman]

Adds cython and PIL as dependencies, and moves `make' execution to after dependency checking.

This reduces the unspecified (and non-PyPI) dependencies to install mwlib (on a fairly new ubuntu installation, only re2c, libxslt1-dev, libxml2-dev and libevent-dev were required).

[schmir]

thanks, but there are a number of problems with this patch:

• PIL doesn't install with pip/easy_install. Therefor we didn't specify the dependency on purpose!
• We don't want to introduce a dependency on cython. Yes, it's needed when building from the git repository, but it's not needed when building from PyPI!
• "python setup.py sdist" will now not call cython/re2c in order to compile the cython/re2c files. This could be solved by a custom sdist command...

Note: you also need some more header files installed in order to have a fully working PIL installation. see mwlib.readthedocs.org for more information.

[jnothman]

Okay. Now I understand that the issue is not whether PIL installs with pip, but whether it installs with all necessary flags. I had wondered whether that was the case, but had not found the readthedocs material (I had been working well behind HEAD). For my application, I don't require mwlib's use of PIL, only that our modified parser may be deployed with minimal fuss.

Thanks for the clarification.