[1.7.x] Fixed #24704 -- Clarified system check interaction with runserver.

    ``pyinotify`` support was added.

When you start the server, and each time you change Python code while the

server is running, the server will check your entire Django project for errors (see

the :djadmin:`check` command). If any errors are found, they will be printed

to standard output, but it won't stop the server.

server is running, the system check framework will check your entire Django

project for some common errors (see the :djadmin:`check` command). If any

errors are found, they will be printed to standard output.

You can run as many servers as you want, as long as they're on separate ports.

Just execute ``django-admin.py runserver`` more than once.