[Crash-utility] crash version 4.0-2.20 is available

- Fix to recognize 2.6.16 change that removed the x86_64 cpu_pda[] array of x8664_pda structures and replaced it with a _cpu_pda[] array of pointers to those structures. Without the patch, crash failed during initiatization of 2.16.16 x86_64 kernels with a "crash: cannot resolve cpu_pda" error. (rachita(a)in.ibm.com) - Added a minor enhancement to the "list" command to allow the "start" argument to also be an (expression) that evaluates to the address of the starting list_head; previously it only allowed a symbol or a virtual address. (anderson(a)redhat.com) Download from: http://people.redhat.com/anderson