js/loader: autorefresh requests should run parallel

The check whether a request was already running failed as soon as
another request was activ. Now they run as they should.
Monitoring\Object\Service: don't load host comment

I'd like to reintroduce those columns, showing last object comment
and so one. Those joins are costly, we can fetch host comments way
easier directly from host object once we are here. But I guess we
don't even need it.
ConfigController: re-add devtools action

I accidentally removed it. Don't care about this right now, this is
just a playground.
ActionController: benchmark should measure rendering

We have been cheating a little bit, now the measurement should be more
precise.
Widget\Limiter: show "all"

In case we pass limit=0 we show this, still unsure whether we should
provide a link for "showing all" - might really hurt with millions of
history rows.
list/services: don't count with no limit

This is a performance evaluation right now, we might delegate such
logic to paginator later on. Cuts load time for lists and/or dashlets
with complicated filters by 50% - only for those with limit=0 of course.
Ido\StatusQuery: fine-tune query filters

This is still experimental. We normalize a lot of columns, this allows
us to sort in a convenient way while having nice "showable" columns.
When used as filters (same goes for ordering) however, functions and
operations on table columns often hinder the db from using indexes.

The new filter implementation allows us to override query creating per
single column, that's what this first sample is trying to show. We still
need to fix alias handling, so unfortunately I have to deal with "real
columns" in the case construct.

Performance gain in large environments is impressive, more to come.
DataView: ignore case on sort dir

fixes #6573
monitoring/status: re-introduce comments, problems

This re-introduces expensive columns been disabled time ago and adds
even more to it. We are now showing last comment, last ack comment and
service problem count on hosts in list views.

It still costs performance, but seems that we can stand it. I'd like
to add more like this to the host view.