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--crossdb option for joining across databases (#1232)

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* Test for cross-database join, refs #283
* Warn if --crossdb used with more than 10 DBs, refs #283
* latest.datasette.io demo of --crossdb joins, refs #283
* Show attached databases on /_memory page, refs #283
* Documentation for cross-database queries, refs #283
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docs/internals.rst
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@ -677,6 +677,9 @@ The ``Database`` class also provides properties and methods for introspecting th
``db.is_memory`` - boolean
Is this database an in-memory database?
``await db.attached_databases()`` - list of named tuples
Returns a list of additional databases that have been connected to this database using the SQLite ATTACH command. Each named tuple has fields ``seq``, ``name`` and ``file``.
``await db.table_exists(table)`` - boolean
Check if a table called ``table`` exists.