Make unhandled hosts/services configurable

This patch moves the definition of unhandled/open problems
into settings.py

As a side effect of this, definition of unhandled can be overwritten
in adagios.conf by adding these to the config file:

UNHANDLED_SERVICES = {
    'state__isnot': 0,
    'acknowledged': 0,
    'scheduled_downtime_depth': 0,
    'host_state': 0,
    'host_scheduled_downtime_depth': 0,
    'host_acknowledged': 0,
}
UNHANDLED_HOSTS = {
    'state': 1,
    'acknowledged': 0,
    'scheduled_downtime_depth': 0
}

This partially fixes #471 although we are not providing the ability
yet to configure this from the settings web interface.
Merge branch 'cleanup-utils_get_xxx' into dev
Merge branch 'feature-unhandled-is-configurable' into dev
Merge branch 'advanced-search-dialog' into dev
New feature: Saved searches

This patch adds "Saved searches" to adagios.

How it works:
* User opens a specific view (like a specific service detail)
* User clicks the + add the bottom of left sidemenu
* User gives a name to this search and clicks save
* The saved search is added to the left sidemenu
Fix typo in adagios_status

Typo in call to populate_saved_searches_sidemenu caused
saved searches not to be updated until page was refreshed.
Merge pull request #478 from opinkerfi/feature-saved-searches

Feature saved searches