Stop creating scripts by default

[Georges Racinet]

Currently, the recipe will build console scripts of all intermediate packages.
While this can be useful, this adds confusion in most.
Besides, those scripts that would interact with openerp (such as a paster or gunicorn) are really confusing : they'll get the latest processed openerp part in their sys.path.

Examples: if gunicorn is wanted, we get bin/gunicorn_django, that we don't care about.
On the other hand bin/gunicorn openerp:wsgi.core.application -c some_conf.py works for the latest part only.
bin/change_tz will also get the latest openerp on its path, which is harmless.

Users will be able to have the desirable scripts back by specifying them explicitely:
  scripts = change_tz

[Georges Racinet (gracinet)]

Released with 0.17