Sorting enhancement

[evescat]

Related to #152

• Currently all filters can be "on", thus user doesn't know how results are sorted. Maybe we could switch only one filter at time?

• In CONTRACTS sorting by Contact returns empty results.

• In DATASETS we can sort by Embargo Date - where is that parameter available in dataset?

• Suggestion to unify sorting attributes names.
  Dataset has attribute Title (long name) and can be sorted by title. That title is displayed at the top of gray box. In the same way is displayed Project's Acronym (short name) and Title/Full title (long name) is displayed after it. So, when we sort by project's title it is hard to see the order (image below).
  Maybe we could:
  a) display project's Title/Full title in the search page at the top of gray box in separate row? That way it would be consistent with DATASETS display if sorted by title. Titles at the top of box, and for project - acronym below title.
  b) We can change DATASETS Title on to Acronym, to keep consistent with Project, and sort datasets by acronym.

• In DEFINITIONS > PARTNERS are sorted by Name, maybe we can use Title there? So all headers of gray boxes would be the same title? I believe it would be more intuitive if the different modules gray boxes display was more "homogeneous".