Added functions to the API to select type of I/O ID.
Added support for various I/O device IDs including: PCI bus, UUID,
VISIBLE_DEVICES, and name. This is particularly useful for handling
GPUs in a more precise manner through UUIDs or PCI IDs, which are
unique.
Added Infrastructure to support other devices besides GPUs such as
NICs.
Deprecated mpibind_get_gpu_type
Implemented the verbose option of the Flux plugin.
Added Makefile for affinity programs; it was ignored when programs were
added.
