search: "Intro" text above search entries for "pre-defined" collections

[RaoOfPhysics]

e.g.: if you have http://opendata-dev.web.cern.ch/search?page=1&size=20&q=&type=Dataset&subtype=Collision&experiment=CMS containing:

• CMS
• Collision ("primary"?)
• Datasets

You might want the text from the About CMS page appearing above the search:

Primary datasets: full reconstructed collision data with no other selections. The data here are referred to as "reconstructed data"; fragmented data from various sub-detectors are processed or "reconstructed" to provide coherent information about individual physics objects such as electrons or particle jets.

[tiborsimko]

@RaoOfPhysics While it would be very nice to have various search hints in place -- e.g. we mused about "collection texts" appearing there quite like yo u mentioned -- this search improvement is definitely not for the current sprint iteration... I'm changing the milestone.