core (memory/sql_mapping): remove autoincrement: SQLite specific behaviour with autoincrement (https://sqlite.org/autoinc.html) is actually already handled by SQLAlchemy, and unsetting autoincrement cause troubles when storing new objects.

version: "3.6"
services:

  backend:
    image: libervia/backend:dev
    build: backend-dev

  web:
    image: libervia/web:dev
    build: libervia-web-dev
    depends_on:
      - backend