Use less(1) as default pager for new user accounts
swapon(8): Remove forgotten initialization of iflag (which broke booting).

While here, add -i to the manpage's synopsis.
time: Add functions to calculate time difference

Caller MUST make sure that the two time measured is on the same CPU.
polling: Utilize microtime_pcpu
acpi/cstate: Utilize microtime_pcpu instead of ACPI timer
acpi/cstate: Save bus tag and handle to I/O operation beforehand
acpi/cstate: White space cleanup