Standard import jobs: refine isEntityValueEqual() logic. (I hope it does not have adverse effect on existing imports; the '' is equal to NULL is grabbed out of thin air. I don't want either to be equal to 0 though.) Also, get default values from database schema and do not set 'changed' flag if import value is NULL and entity value is the default.

Implement drush command to start a process and run a full process; change lots of logs strings so that they don't output HTML in drush console output.

Fix some more bugs in the UI & logging, and implement one TODO about setting different logging settings during start vs. rest of the process (which was already possible).

Implement new 'method' field in status info / table; renumber 'running' and 'run_info' items. Document an extension of run_info for queue-like processes but do not implement it yet.

Various unrelated bugfixes / changes, while working on the previous 3 commits. Also, move _drunkins_s/get_process_info() into run.inc (unchanged), because we do a module_load_include at the top of every function anyway (because we keep forgetting that _drunkins_log() is in run.inc too). And delete some deprecated config.

Replace 'override_fetch' setting in drunkins_run_start() by a separate argument because I'm tired of deciding whether it's "not a job setting" or "not a runner setting". (And having it as a job setting means namespace issues.)

Make the standard product import job capable of triggering a stock update (using the standard stock update job) whenever a new product is imported.

* Make drunkins_enqueue_items() support a new 'can_override_fetch=pass_through_start(_by_default)' capability / proper logging after queueing the items  / enqueue_by_fetcher. The capabilities are not fit for use yet, though (see lots of @todos about locking).
* Squash bugs in drunkins_enqueue_items().
* Change 'skip_last_marker' runner setting to 'add_last_marker', which is clearer - now that we decided to make it have different default in different functions.

Make a plan for tackling complications around doing certain calls on hook_cron_queue_info() vs hook_cron(). Move the commented-out buggy _drunkins_queue_process_check_finish() call from the former to the latter, so we can uncomment it - and officially document the 'process_items_after_rerun_start' setting as "not working / processes won't start" for now.

Some fixes to last year(!)s importers rewrites; some @todo/warnings in the runner. After commenting out some dangerous code, it is now possible that processes do not properly finish anymore...

Change _drunkins_get/set_process_config, remove the 'running_or_starting_process' argument value (I truly don't know what the exception for force_cron/progressive settings was supposed to be; force_cron should certainly be stored.) Change the way 'override_fetch' (which isn't really a setting) is handled. 
Also use the calls more consistently.

Fix return value from drunkins_cron_queue_info() to work with elysia_cron 2.1. In fact, only return queue info for processes that should be running from now on; this is more understandable and makes us need only one large if() statement.

INCOMPATIBLE CHANGE: redefine job interface(s) to include @throws and make the runner code handle them. For now, back out settingsForm() from the official interface specification.

Fix 'enqueue_by_fetcher' handling (until now, jobs were always terminated upon start!) plus 2 more bugs introduced somewhere in the past months.

- fix drunkins_get_job() so it can handle 'process_runner_settings' being empty (bug introduced recently)
- fix some other code to properly handle finishing off a failed batch process.

Implement log level and properly implement log_severity_no_items. Make clearer that 'logging' is a runner setting as far as our code is concerned (though we still use it as a 'direct job setting' in cases we don't use a runner.)

Now that run settings are used more consistently, create separate functions to get/set them and don't pass them through function parameters anymore. Change first parameter to logging function. Also, move drunkins_get_job() into .inc file because it's an internal function.

Hopefully fix a bug in HEAD^^ drunkins_start_job() where $info['process_runner_settings'] was not set.

Half baked support for 'enqueue_by_fetcher' run setting, with lots of @todos. Works on cron (if you hack your fetcher/job to do DrupalQueue::get($this->settings['job_id'])->createItem($item) by itself), not for batch processes.

Rename 'run options' to 'runner settings' and use them a bit more consistently: move 'class' and 'fetcher_class' into them. (Meaning you can theoretically call drunkins_run_start() to run a queue job without defining config in an info hook.) hook_queue_info() definitions now have a 'runner_settings' section but for the rest, code behavior should not have changed.

Use less memory when listing items, by printing out lines of HTML one by one rather than storing them.

Debug/fix issues in HEAD^^; implement run option 'process_items_after_rerun_start' (not tested yet) and make the code consistenly behave like that option is not set by default.