(bug 44674) "Full-text search" section for entity search

Change set depends on change Ia67b5aea6886bba460dff7535e2306234201624c in the
DataValues extension.
The entity selector replacing the native search box now will display an additional
section in the list of suggestions that allows triggering a full-text search.
For the moment, still, the list of suggestions will close when there are no
suggestions. This will be addressed in another commit since that behavior depends
on another change set.

Change-Id: I2d9c8554f3e531977997ebc8120621b79730a130