Reinstate failglob behaviour for most commands

Expand globs to zero arguments (nullglob) only for set, for and count.

The warning about failing globs, and setting the accompanying $status,
now happens regardless of mode, interactive or not.

It is assumed that the above commands are the common cases where
nullglob behaviour is desirable.
More importantly, doing this with `set` is a real feature enabler,
since the resulting empty array can be passed on to any command.

The previous behaviour was actually all nullglob (since commit
cab115c8b9933ae7db9412c66d452c0ccb2d7152), but this was undocumented;
the failglob warning was still printed in interactive mode,
and the documentation was bragging about failglob behaviour.

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