Previously, I used a shell script to extract modification date ranges
from the Git history, but that was complicated and unreliable, so now
every file just gets the same year range in its copyright header. If
someone needs to know when a specific file was modified and by whom,
they can look at the Git history themselves; no need to include it
redundantly in the header.
It's amazing to me that ebp and esp have been swapped for over three
years without anybody noticing. It was dumb luck that the Trace test
(which is designed to catch just such a thing) happened to fail when I
ran the whole suite, and further investigation revealed that it was
failing maybe five percent of the times it was run. Now we know why.
This is necessary to avoid name conflicts on various platforms. For
example, iOS has its own util.h, and Windows has a process.h. By
including our version as e.g. "avian/util.h", we avoid confusion with
the system version.
