When executing grml-terminalserver on grml96 then booting from a client via PXE fails if you're selecting the grml64 flavour (it works 
fine for the grml32 one though).

This is caused by serving /var/lib/tftpboot/vmlinuz and initrd which are copied from the 32bit flavour when running in the grml96 setup 
-> we can't handle multiple kernels/initrds yet. We would have to copy kernels/initrds without overwriting each other and then also 
rewrite the /var/lib/tftpboot/*.cfg files to select the proper files depending on what you want to boot.

Issue identified by following a problem reported by opiwahn on IRC.