Extract parseDateRange
Extract userToSelect2Option; Proxy select2opts.allowClear
Allow user searches by name or username, sort by name
KAVI users can search programs by registration date or classifier
When search includes registration date range, sort by regDate and show it in result row
Refactor: Move search function inside handler
Redo look&feel for kavi-search-filters

* Align input fields
* Use common input field css
* Use same clear-x-icon
* Prevent search-results from jumping when registration date set/unset
Show registration-date in search result row when logged in
Make search filter checkboxes "fit" more snugly

I think they also make a bit more sense in this order.
Now that registration date is "always" shown, make sure it exists
Match user search term with any part in the user (including lastname)
Merge pull request #45 from kavi-fi/kavi-search-filters

Kavi search filters