time-to-seconds and float-time

[Stefan Monnier]

time-to-seconds has been marked obsolete since Emacs-21.
AFAIK, it's the only "obsolete since 21" that we still have, so I'd like
to get rid of it.

But I see that even our own bundled code still makes use of it, and the
time-date.el file has to do a funny hideous dance to define
time-to-seconds as on obsolete alias.

Apparently the problem is that its replacement (float-time) was not
taken up by XEmacs, so any package that wants to be compatible with
XEmacs ends up preferring time-to-seconds.

But there's another reason: while time-to-seconds is obsolete and
replaced by float-time, its inverse is not obsolete and is called
seconds-to-time.  So the "time-to-seconds" name is not a bad choice.

So I'm really tempted to inverse the situation: de-obsolete
time-to-seconds, rename Ffloat_time to Ftime_to_seconds, and mark
float-time as an obsolete alias instead.

WDYT?


        Stefan