Fix a_unselect not being called when hiding selected answer

Fixes #443.
Extract output buffering to function.
Use regular buffering if gzip option not set.
Use buffering in AJAX requests, to avoid “headers already sent” warning
in some situations.

Fix session_start after output started

Fixes #439

Let user input a confirmation code manually

Include confirmation code in confirmation email

No longer supporting PHP 5.1.
Fixes #394

Fixes #472

Fixes #425

Remove unnecessary step in password reset

Fix words falling off the edge of the answer container

Add form file field to base theme

Fix double slash in default site_url option

div end marks for better html debugging

Some minor changes

A few filter-basic fixes

Fix users being unable to see all their own profile fields