unify --quiet and --query

[IlanCosman]

Here are the (non-string) commands that use these flags:

--quiet	--query
command	abbr
jobs	builtin
type	functions
	set

All of these commands use the flag in a similar way, printing no output but setting an exit status. In particular builtin -q, functions -q, command -q, and type -q are nearly identical in their usage, yet are split half and half between --query and --quiet. No command has both flags.

In line with the law of discoverability, the --quiet and --query flags should be merged.

[faho]

In particular builtin -q, functions -q, command -q, and type -q are nearly identical in their usage

They didn't use to be. You used to have to use command -sq, because command -s was the original thing to find a command.

We changed it when we noticed that --quiet had no other use by itself. At the time I decided not to change --quiet to --query because of backwards-compatibility.

That means the most we can do is to add both (and deprecate one).