Add support for merging multiple items and creating redirects by default

[dpriskorn]

fixes #916

[dpriskorn]

Not ready yet

DEBUG:wikibaseintegrator.wbi_helpers:{'action': 'wbmergeitems', 'fromid': 'Q333', 'toid': 'Q70', 'format': 'json', 'ignoreconflicts': 'description', 'bot': '', 'tags': 'wikibaseintegrator', 'token': '<token>+\\', 'assert': 'bot', 'maxlag': 5}
DEBUG:urllib3.connectionpool:https://dance.wikibase.cloud:443 "POST /w/api.php HTTP/1.1" 200 104
Merged Q333 into Q70
INFO:wikibaseintegrator.wbi_helpers:Creating redirect from Q333 → Q70
DEBUG:wikibaseintegrator.wbi_helpers:{'action': 'wbeditentity', 'id': 'Q333', 'clear': 'true', 'summary': 'Clearing Q333 to prepare for redirect', 'format': 'json', 'token': '<token>+\\', 'assert': 'bot', 'maxlag': 5}
DEBUG:urllib3.connectionpool:https://dance.wikibase.cloud:443 "POST /w/api.php HTTP/1.1" 200 236
ERROR:wikibaseintegrator.wbi_helpers:Exception when creating redirect Q333 → Q70: 'The "data" parameter must be set.'

[LeMyst]

Hello @dpriskorn
Thank you for this PR.
I think there is changes needed :

• Don't remove the merge_items function, to avoid breaking changes.
• I think you can add two parameters, a boolean create_redirect, False by default. And a merge_logic with an enum TO_LOWEST/TO_HIGHEST/DEFAULT, to override the logic in the parameters "to" and "from".

What do you think about theses changes?

[dpriskorn]

Hello @dpriskorn Thank you for this PR. I think there is changes needed :

* Don't remove the merge_items function, to avoid breaking changes.

* I think you can add two parameters, a boolean create_redirect, False by default. And a merge_logic with an enum TO_LOWEST/TO_HIGHEST/DEFAULT, to override the logic in the parameters "to" and "from".

What do you think about theses changes?

I like your suggestions :) My code was basically a quick hack.