Fix #445: Signed/unsigned problem with MySQL 5.5
Fix #445: Signed/unsigned problem with MySQL 5.5

This should work fine as long as page trees aren't nested to several
dozens of levels...

nickburlett/feincms,mjl/feincms,joshuajonah/feincms,feincms/feincms,matthiask/feincms2-content,nickburlett/feincms,michaelkuty/feincms,michaelkuty/feincms,feincms/feincms,joshuajonah/feincms,joshuajonah/feincms,nickburlett/feincms,nickburlett/feincms,feincms/feincms,matthiask/django-content-editor,matthiask/django-content-editor,matthiask/feincms2-content,michaelkuty/feincms,mjl/feincms,michaelkuty/feincms,matthiask/django-content-editor,joshuajonah/feincms,matthiask/feincms2-content,matthiask/django-content-editor,mjl/feincms