Use timestamp instead of time-stamp uniformly in Org (was: How to update a timestamp?)

[Ihor Radchenko]

Alain.Cochard@unistra.fr writes:

> Also, when searching through the manual for time-stamp, I was a victim
> of the time-stamp/timestamp curse :-)

Manual overwhelmingly uses timestamp, except several "time-spamped",
which appear to be just right.

Not so much for function and variable names. Some (few) use time-stamp
with dash.

Would you be interested to create a patch?
We can simply provide "timestamp" aliases to "time-stamp" functions and
variables and then mention the aliases in the manual.

-- 
Ihor Radchenko // yantar92,
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