Bug 27904: Improve display in creating profile for staging MARC records for import

Bug 27904: Improve display in creating profile for staging MARC records for import

This patch updates the Stage MARC records for import page, in particular
the format of the part of the form for saving or removing a profile.

The page moves these controls into their own fieldset so that it is
clear they are separate from the "Stage for import" button. The "Remove"
control now includes the name of the profile which will be removed.

To test, apply the patch and go to Tools -> Stage MARC for import.

 - Upload a file of records.
 - Make some changes to the settings and options.
 - At the bottom of the form you should see a "Save profile" fieldset.
 - Confirm that the "Save profile" button becomes enabled if you type
   something in the field (or paste something, or select something from
   form history).
 - Confirm that the profile is saved correctly by re-uploading a MARC
   file and selecting your newly added/edited profile and confirming
   that  the values are set as expected.
 - In the "Save profile" section there should be a "Remove" link styled
   with a Bootstrap "trash" icon: "Remove profile: <profile_name>"
 - Confirm that profile deletion still works correctly.
 - Confirm that the "Remove" link is updated correctly when you make a
   selection from the "Profile" dropdown at the top of the form:
   - Choosing "Do not use profile" should change the "Remove" link to
     drop the name of the profile and disable the link.
   - Choosing different profiles should update the name in the "Remove"
     link.

Signed-off-by: Barbara Johnson <barbara.johnson@bedfordtx.gov>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>