CogVM binaries as per VMMaker.oscog-eem.163/r2559.

Make wakeHighestPriority filter-out zombie processes; fixes Newspeak/Glue crash.

Add -blockonerror flag to Unix & Mac VMs to allow attaching gdb on error/segv.

Make the sigsegv handler catch SIGILL and SIGBUS on Unix and Mac.

Add 64-bit file support to linux builds.

Fix sqUnixX11.c ClipChildren to ClipByChildren.