If there is a display name, it will be used in all views (task lists,
task details, comments).
Made a view for task lists, because it was cleaner and because they're
all more or less the same anyway.
This initial import is a heavily modified version of the code I had
here, as Arse was modified for other purposes in the meantime and the
application no longer worked with it.
In addition:
* I did not import the user management part yet,
* task dependencies are supported in-base, but there is no interface
for that yet.
