more kresd.8 cleanup



See merge request !35

emacs turds should never make it into git



See merge request !34

Doc cleanup

This is a simple cleanup of documentation

See merge request !33

Suggested by @ondrej.

when whole interface is passed and some of the addresses are not bindable,
the daemon will print them, but will continue to bind to the rest of the
addresses

fixes #80

all relevant modules now support running in
forked mode and polling workers for information.
for example graphite module can poll stats from
all workers and then aggregate before sending,
or HTTP module can run on the process group leader
only and then poll workers for information.

forks are connected with IPC pipes to process
group leader and can execute expressions on its
behalf. so running commands over all workers
is easy now:

> hostname() -- single
localhost

> map 'hostname()' -- all
localhost
localhost
localhost

* the dygraphs are now leveraged for drawing as
  canvas based drawing is much faster than
  svg based rickshaw
* refreshed theme and layouts, code cleanup

the e638f9fb introduced deduplication
for queries over UDP, the idea is to track same queries and answer
only once, however that introduces both constant processing and
memory overhead and could break clients who count packet loss
by queries sent/received. disabling for now.

* the http module collects stats snapshots on one
  central location and then streams it to clients
* history of last 120 datapoints (at least 2min)
  is kept for convenience

* rules may now be chained if the rule action
  doesn't return next state. in this case, next
  matching rule will be executed. this is useful
  for snooping actions
* rules now may be paused/deleted
* implemented a new action for query mirroring to
  given destination

* in the begin() layer, the incoming query is
  exposed as req->qsource.packet, it is invalidated
  after begin() and should not be modified
* the destination address (local interface) is
  also tracked for filtering purposes

the interface has a declarative rule builder that
assists in building and validating rules, as well
as seeing how much traffic do they match

this is going to be the building block for visual
ui as it provides many useful semantic objects and
style classes. since we already provide the
snippet system, it's possible to add subpages to
the ui without hacking everything inside

these are used as a handle to patch/modify rules
later in their lifetime, also added a rule match
counter to find out which rules match inbound
traffic