update `is-null-or-empty` to use simplified invert
map.fields entries more similar to b.f.Field

the `to` field can be left out when it matches the `from` field,
and the `filter` specifier can be left out similar to when using
the default bundle filter and including "extra-filters".

also note that the previous commit erroneously contained some of
the changes noted here (and in incomplete form).
extra clean-up for two commits ago
use latest snapshot netty
Merge branch 'master' into spiegel/path-query-glob