Multiple connections per database

An Adamo Database can be more than one physical database. Multiple connections are also used to implement shared tables.

Refering articles:

• multiple connections, populate() (code changes 10.01.05) — lino:tests/10.py is more difficult to find. Worked a whole day without getting it running. But quite some changes in adamo. Especially (1) better support for Multiple connections per database. (2) Populating databases more