[dev-context] Time primitives

Hi Hans, Would new (pdf)etex primitives like these help benchmarking context? Two static read-only values that amend the normal TeX ones like \time and \year, giving the passed seconds since 1 jan 1970 at start-of-run: \epochseconds % integer part \microseconds % fractional part (between and 0-1000000) And one dynamic one: \microinterval % interval since start-of-run, in microseconds The static seconds and microseconds have be split in two because the multiplication of two C long-s cannot fit in one \count register. I need the initialization values only so that I can create meaningful intervals, but I thought it might be useful to have them available. If you prefer something more or different, let me know. Taco