If brand_link specified in modopts, use that as href for navbar-brand link (BBS name at top left); for CG.

If 'code' query param exists, is a valid xtrn code, and user can access, then jump right into it after the page loads. (Requested by Mortifis.)

SBBS v3.19 introduces a built-in FileBase class. To resolve this
conflict, rename the soon-to-be-deprecated FileBase object to
OldFileBase.

- Default gender of ' ' (instead of '')
- Don't write the gender to the user's birthdate

Exit immediately if client attempting redirect to arbitrary external site. (This won't work for them anyway, but no need to run the rest of the script.)
Use js.exec() for components instead of load().
Use <? ... ?> instead of <?xjs ... ?> for XJS one-liners.

listSubs doesn't need to return that much detail. New stuff will be exported as part of 'forum' object, for use with require().

Added get-thread call, support for generatorish reply value. list-threads doesn't need offset, instead will begin at the message after 'after' if given.

This page is not usable yet. Don't use it. I don't want to hear
about it. Don't look at it. Don't look at me. Don't look at
anything. Just close your eyes and shut up.

extra param.

Added getNewestMessagePerSub(grp) and getNewestMessageInSub(sub);
these do pretty much what you would guess, although maybe not
exactly because what is "message" anyway?

Added 'guest' mode to getThreadStats, since some stats (votes)
can be shown to guests, but others (unread messages) shouldn't.

When the property was changed, it now blows up on any browser with the previous configuration schema, explicitly checking for the expected text value without parsing.