Lite säkerhetsfix och så lite buggfix:

Sending newsletters could cause a timeout on large boards.
Reporting a personal message needed some more sanitation.
Session fixation could, in rare cases, be applied – reported by David Vieira-Kurz.
Prevent recursive functions from causing a stack overflow in PHP – reported by Stefan Esser.
Fixed a bug causing some expressions to trigger an error in UTF-8 mode.
Quick edit wasn’t updating the subject correctly if it was the first message.
The package manager could in rare cases get itself into a loop.
Characters weren’t properly escaped in [html] parts of the signature
Quick edit didn’t check whether a topic was being locked

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