users file and "!*" comparisons

[Alan DeKok]

Daniel Larsson wrote:
> The second one isn't looked at in any case. Even if Some-Attr does *not*
> exist, the check returns false immediately, regardless of the presence
> of Other-Attr.

  OK, that would seem to be a bug.

  In any case, the "unlang" feature in 2.0 has an entirely new
implementation of the operator matching (well tested, too.).  It's a lot
easier to understand, and it works.

  Alan DeKok.