Write tests for test plan number 4 (admin panel)

[strk]

Use the Admin Panel to

a): create new users and add permissions, b): edit system codes to affect the application create and remove things c): publish the Gazetteer

[strk]

When testing the admin panel manually (make docker-qgis-start) I get a Gazetteer authorization error:

You are not authorised to run gazetteer administration functions

The error, according to code, is triggered when the user is not DBA:

elf._controller.database().userIsDba()

In turn that function invokes SQL function:

return scalar("select gazetteer.gaz_IsGazetteerDba()")

According to the About panel:

Database user: gazadmin

The SQL function does:

SELECT EXISTS (SELECT * FROM gazetteer_users WHERE userid=current_user AND isdba);

We're indeed NOT populating the gazetteer_users table, neither directly nor via the gazetteer.gaz_AddUser function. I guess we should. Also, if we do, we'd need to switch to the gazdba user, which we create, to have those permissions (right now the plugin configuration uses gazadmin instead)

[strk]

PR #155 helps with the above