sar/mpstat: Allow selection of a range of IRQ/CPU

sar/mpstat: Allow selection of a range of IRQ/CPU

Update sar so that the user can now select a range of interrupts with
option -I (in addition to selecting individual interrupts).
E.g. "sar -I 2,5,10-16,400- (...)"
Keyword XALL is removed with option -I.
Keyword ALL selects all possible interrupts, including the sum of them.

Also update mpstat so that the user can select a range of processors
with option -P (in addition to selecting individual processors).
E.g. "mpstat -P all,0,5-7 (...)"

Signed-off-by: Sebastien GODARD <sysstat@users.noreply.github.com>