Unifies all posts on a single table

[fourfivesix]

Thanks @czaks and @ctrlcctrlv for all the help.

I think this is done. Unfortunately I have taken too long to do this so I think it diverges a little bit from the current code. I'll do a merge and review the conflicts.

[fourfivesix]

@ctrlcctrlv, I'm afraid that the new install.php might take too long and timeout. What can be done about it?

[czaks]

sprintf -> prepare

[fourfivesix]

Thanks for the comments, @czaks! I was a bit cautious when changing sprintfs that weren't used just for posts_%s. I'll make those changes.

[fourfivesix]

@czaks, I've made most of the changes you've requested.

I'm not sure about how to do the remaining changes in templates/themes/recent/theme.php, any help? 😞

In ukko, I've made a change to how the threads are selected. Instead of:

SELECT * FROM ``posts`` WHERE ( `board` = 'a' OR `board` = 'b' ...potentially 3000 more comparisons... )

I've decided that this may be more efficient:

SELECT * FROM ``posts`` WHERE ( `board` != 'secret' OR `board` != 'secret2' ...potentially less comparisons... )

Also, is it okay to do a SELECT here without a limit? This table is going to be huge.

[fourfivesix]

@czaks, two points that I've discussed with @Lineark:

1. About the posts count in templates/themes/recent/theme.php. I couldn't find a better way to calculate it. Because we don't have a global id counting every single post, I think we'll have to add up each board like we're doing now.

2. About the unique IPs count in templates/themes/recent/theme.php. We could just do:

SELECT COUNT(DISTINCT(`ip`)) FROM ``posts``

We would be including the secret boards in this count, but it would be fast.
If we want to remove the secret boards, we would have to do the same as I did on ukko:

SELECT COUNT(DISTINCT(`ip`)) FROM ``posts`` WHERE (`board` != 'secret' OR `board` != 'secret2' ...)

What do you prefer?