database plugins

The ewiki.php core script contains a database request function which is
tailored to a MySQL database. However that function is already prepared
to chain to another "database abstraction" function if desired.

prev << "database plugins"
next >> "built-in MySQL support"

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You cannot modify the README.plugins file, but anyhow any ideas or suggestion should as usually get filed on BugReports, UserSuggestions or even better the README.plugins.Discussion.