run_api interface is cumbersome and error-prone

[ltalirz]

The current run_api interface for running the AiiDA REST API has unnecessarily many parameters, making it complicated to use in WSGI scripts, e.g.:

from aiida.restapi import api
from aiida.restapi.run_api import run_api
import aiida.restapi

CONFIG_DIR = os.path.join(os.path.split(os.path.abspath(aiida.restapi.__file__))[0], 'common')

(app, api) = run_api(api.App,
                             api.AiidaApi,
                             hostname="localhost",
                             port=5000,
                             config=CONFIG_DIR,
                             debug=False,
                             wsgi_profile=False,
                             hookup=False,
                             catch_internal_server=False)

While all but the first two parameters are keyword arguments, the code will actually crash if they are not provided.

In reality, there is no reason to have to specify any parameters whatsoever and one should simply be able to call run_api().

[sphuber]

Fixed in PR #3875