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a689e9185a
* Update docu and logging * Extracted and updated constants from `worker_desc` into separate file * Update and re-calibrate communication error handling * Allow simplified pivot negotiation why: This feature allows to turn off pivot negotiation so that peers agree on a a pivot header. For snap sync with fast changing pivots this only throttles the sync process. The finally downloaded DB snapshot is typically a merged version of different pivot states augmented by a healing process. * Re-model worker queues for accounts download & healing why: Currently there is only one data fetch per download or healing task. This task is then repeated by the scheduler after a short time. In many cases, this short time seems enough for some peers to decide to terminate connection. * Update main task batch `runMulti()` details: The function `runMulti()` is activated in quasi-parallel mode by the scheduler. This function calls the download, healing and fast-sync functions. While in debug mode, after each set of jobs run by this function the database is analysed (by the `snapdb_check` module) and the result printed.