[libvirt] [PATCHv3 00/17] new VIR_(APPEND|INSERT|DELETE)_ELEMENT macros

DO NOT BE SCARED OFF BY THE PATCH COUNT!! Most of these are very short, and they all follow the same pattern; beyond that, 01/17 and 02/17 are the only ones that are really time-sensitive. The first patch in this series adds new macros to insert/append/delete elements from the arrays of variously-sized structs that are commonly used in libvirt. The intent is to eliminate the arithmetic mistakes associated with calling memmove() directly, and shorten application code. A full description of the added macros and their functions is included in 01/17. Patches 02..17 convert various bits of hand-coded array manipulation in libvirt to use the new macros. They can be taken now, later, or never (although I'd like to have at least 02/17 taken now, since other similar functions will be added in an upcoming patch series, and I want them to all use the same logic). Mostly I went through all of those conversions to see just how useful/usable the new macros were (and they led to a couple of rewrites). I will be posting another series momentarily that has a dependency on 01/17.