Merging in fixes and updates from stable

Major fixes to the ban system - large IP match lists don't slow down the server miserably anymore.

Fixed a couple of renaming issues in the installer

Hopefully managed to put enough hacks in there to make renaming the config file the last step, so if it fails, it can be done manually

Removed stray debug message in installer

Merging in fixes from stable

Some (not much) progress with localizing tooltips on the pagebar. Still aways to go and committing so as to merge changes from stable

Well I'm an idiot - the fulltext index on page_text was missing from a default installation. It didn't break searches but probably slowed them down tremendously. Also set engine to MyISAM on page_text to avoid cryptic error messages from MySQL.

Major improvements in the security of the CAPTCHA system (no SQL injection or anything like that); fixed denied form submission due to _af_acting on form object wrongly switched to true

Javascript validation for install DB info form didn't allow dashes

Changed default content for the main page to something a lot more user-friendly and helpful

Rewrote some security code in PageUtils::savepage to accommodate the ACL system better; there was an issue with non-admin users saving pages on which they have edit rights but wiki mode is turned off

Fixed: secure-cookie option is no longer set if $_SERVER['HTTPS'] is set but == "off"

Patched in dash-in-database-name fix from unstable

Merge in installer fixes from 204 (ba28d43a6b86)

Merging in all changes from revision 185 (90b7a52bea45)