! Fixed this huge installer bug that caused all paths to be wrong; it was simply due to a function being called too late in the process. Apologies to those affected. I guess a lot of support topics can be closed now, yay. (install.php)

- Removed some very, very old leftover code. If it makes you feel better (or me?), it's also still in SMF and Elk. Nobody seemed to bother that infile_css is just not used anywhere else in their codebase, so it happily lives on here, unaware that it's wasting your time on each install. (install.php)