[server] introduce a scheduler class to run repository "looping tasks" We just use the sched module from the standard library and introduce a tiny Python2/3 compatibility layer (more for convenience actually). The "looping" aspect of tasks (previously in LoopTask class) is re-implemeted as a `schedule_periodic_task` function. This is a reasonably thin layer as compared to LoopTask/TasksManager classes. Only the "restart" aspect of LoopTask is no longer present as I'm not sure it's worth keeping. The advantage of using this (in addition to eventually dropping our custom code) is that this scheduler class provides a `run` method that blocks the process while running tasks in its queue. So we can rely on this to have a 'scheduler' ctl command (see forthcoming patch) that would only run "looping tasks" without having to implement the "blocking" aspect ourself. Related to #17057223.

CubicWeb semantic web framework
===============================

CubicWeb is a entities / relations based knowledge management system
developped at Logilab.

This package contains:

- a repository server
- a RQL command line client to the repository
- an adaptative modpython interface to the server
- a bunch of other management tools

Install
-------

More details at https://docs.cubicweb.org/book/admin/setup

Getting started
---------------

Execute::

 apt-get install cubicweb cubicweb-dev cubicweb-blog
 cubicweb-ctl create blog myblog
 cubicweb-ctl start -D myblog
 sensible-browser http://localhost:8080/

Details at https://docs.cubicweb.org/tutorials/base/blog-in-five-minutes

Documentation
-------------

Look in the doc/ subdirectory or read https://docs.cubicweb.org/


CubicWeb includes the Entypo pictograms by Daniel Bruce — www.entypo.com