core, setup: huge cleaning:

- moved directories from src and frontends/src to sat and sat_frontends, which is the recommanded naming convention
- move twisted directory to root
- removed all hacks from setup.py, and added missing dependencies, it is now clean
- use https URL for website in setup.py
- removed "Environment :: X11 Applications :: GTK", as wix is deprecated and removed
- renamed sat.sh to sat and fixed its installation
- added python_requires to specify Python version needed
- replaced glib2reactor which use deprecated code by gtk3reactor

sat can now be installed directly from virtualenv without using --system-site-packages anymore \o/

src/plugins/__init__.py

@@ -1,7 +0,0 @@
-# FIXME: remove this when RSM and MAM are in wokkel
-# XXX: the Monkey Patch is here and not in src/__init__ to avoir issues with pyjamas compilation
-import wokkel
-from sat_tmp.wokkel import pubsub as tmp_pubsub, rsm as tmp_rsm, mam as tmp_mam
-wokkel.pubsub = tmp_pubsub
-wokkel.rsm = tmp_rsm
-wokkel.mam = tmp_mam