Add nested and/or filtering

Yep, because an 'and' (or 'or')  with only one value is always true.
On 8 Oct 2014 17:44, "Ben Lever" <notifications@github.com> wrote:

> In ivory-cli/src/test/bin/tests/window/input/dictionary.psv:
>
> > @@ -2,4 +2,4 @@ halibut:swiss_cheese|encoding=double|tombstone=T
> >  halibut:cooldown|source=halibut:swiss_cheese|window=1 month|expression=count
> >  halibut:latte|source=halibut:swiss_cheese|window=2 months|expression=count
> >  filter:age|encoding=int
> > -filter:adult|source=filter:age|expression=count|window=2 months|filter=or,18,19,20|tombstone=T
> > +filter:adult|source=filter:age|expression=count|window=2 months|filter=or,(and,18),19,(and,20)|tombstone=T
>
> So the above is equivalent to filter=or,18,19,20?
>
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> <https://github.com/ambiata/ivory/pull/323/files#r18566181>.
>