Remove factorial operators, leaving only the factorial() function.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 76f412ab310554acb970a0b73c8d1f37f35548c6
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2020-09-17T20:17:27Z
Releases: 14.0
Remove factorial operators, leaving only the factorial() function.

The "!" operator is our only built-in postfix operator.  Remove it,
on the way to removal of grammar support for postfix operators.

There is also a "!!" prefix operator, but since it's been marked
deprecated for most of its existence, we might as well remove it too.

Also zap the SQL alias function numeric_fac(), which seems to have
equally little reason to live.

Mark Dilger, based on work by myself and Robert Haas;
review by John Naylor

Discussion: https://postgr.es/m/38ca86db-42ab-9b48-2902-337a0d6b8311@2ndquadrant.com

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