Most of the copyright years in the source code were misleading (the date of
most recent publish was actually later) and all were unnecessary. I've been
removing copyright years piecemeal, for a long time, but I decided it was time
to just perform a bulk search and (mostly) replace. In some cases, I left
old copyright years on files that either are not used (and soon to be removed)
or obsolete and unlikely to ever be touched again (e.g. Win9x FOSSIL VXD). Some
of the runtime binaries still contain copyright years and those were updated to
2018.

outbuf_empty event in sexyz is still having problems with multi-CPU fast
transfers.

Modify all the headers... I already DID this, what happened?  *cry*

(Pulled from SyncTERM since it will also be used in umonitor)