Include floating-point registers in the backtrace

Related to rhbz#812204.

http://sourceware.org/gdb/current/onlinedocs/gdb/Registers.html#Registers

Signed-off-by: Martin Milata <mmilata@redhat.com>
Signed-off-by: Michal Toman <mtoman@redhat.com>
httpd config: remove excessive AllowOverride