Make sure current code is imported, rather than installed code
Change all imports to import from "yokadi.*"

This makes it possible from code outside Yokadi to use Yokadi modules.
Without this change doing something like this:

    from yokadi.core import db

Would fail because db.py did a "from ycli import tui", but the ycli module
is not visible outside Yokadi source code.
New start script
Merge branch 'master' into yokadi-module

Conflicts:
	src/yokadi/yokadid.py
Merge pull request #4 from agateau/yokadi-module

Yokadi module