Rework xci POD: New SYNOPSIS; add EXAMPLES, rename old SYNOPSIS to OPTIONS
Hopefully catch all remaining "ARRAY(0x…).log" issues
Refactor some code duplication in xen-delete-image
Properly clean up after t/xt-create-xen-config.t
t/xen-delete-image.t: Check xen-delete-image exit code

Also run xen-delete-image verbose and print output.