Bug 13218: usability enhancements for z39.50 searches

Bug 13218: usability enhancements for z39.50 searches

This patch rearranges the layout of the z39.50 search pages in cataloguing and
authorities.  There should be no functional change to z-target searching, all
functions should remain the same.

Changes:
* 2 columns of search fields condensed into one
* zTargets moved from below the search fields to beside them
* rearranged search fields into perceived frequency of usage, from most used to
  least
* changed label of Raw (any) to Keyword (any)

To test:
* click cataloguing -> new from z39.50/SRU
* observe how the layout has changed
* import a record or two using the search - there has been no change to the
  function, it should all be working.

* Click Authorities -> new from z39.50
* observe how the layout has changed
* import an authority or two using the search - there has been no change to the
  function, it should all be working.

* sign off if you think these changes are nice. Comments and suggestions are
  also welcome regarding this change.

Signed-off-by: Frederic Demians <f.demians@tamil.fr>
Nice evolution of the z3950 search/result pages.

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>