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this is meant to simplify both the creation of config.php (still from
config-dist.php) and the addition of new config variables that don't
have UI.  they now get added to config-defaults.php which is loaded
after config.php and database.

Improve the robustness of authinstance-in-session handling, to handle an unduplicatable bug (at least by me).

All users who log in to the system should have a valid authinstance in their session. Apparently however, some don't. I can't narrow down how this happens, but this patch will make sure things don't blow up in this case.

Conflicts:

	htdocs/view/columns.php
	htdocs/view/layout.php

When assigning view access, allow users to assign access to any group, not just the ones they're in.