use description as tooltip in tree.
Merge pull request #563 from 4teamwork/jone-tree-description-as-tooltip

Tree: tooltip with description
add a "modified_seconds" index.

The precision of the standard "modified" catalog index is minutes.
For sensitive features we need a more precise index.

Running queries against the "modified_seconds" is more expensive
than running them against the default "modified" index - but
also more precisie.

We need the precise index as repository tree cache key.
use the modified_seconds index as cache key for the navigation.
Merge pull request #565 from 4teamwork/jone-tree-caching-fixes

Tree Portlet: improve cache key precision
Use plone.api to access plone site.

Fixes #552, i.e. an issue with AJAX request from z3c.form inline validation.
Fix tree javascript for inboxes.

An empty js-selector evaluates to true as well. doh.
Merge pull request #567 from 4teamwork/deif-fix-inline-validation-error

Use plone.api to access plone site.
Merge pull request #570 from 4teamwork/deif-fix-inbox-tree

Fix tree javascript for inboxes.
Reactivate the wrongly disabled statefilter for dossier listings.

With the adjustments in the PR #426 the statefilter for dossier listings gets disabled by mistake.
This PR reactivate it.