Bug 26727: (follow-up) More markup corrections

Bug 26727: (follow-up) More markup corrections

This patch makes more markup changes to the templates previously
modified in order to try to arrive at some agreeable solutions.

- In the value_builder EXAMPLE template, the <p> is unnecessary and is
  removed. Also removed is the script "type" attribute and obsolete
  CDATA markers.
- In the article request template an unnecessary <p> is removed.
- In the merge patrons template the submit button is now in a <fieldset
  class="action"> as is consistent with other forms.
- In the MARC modifications template I've added <div>s around each
  "line" in the form to add the line break, along with some CSS to add
  margins.
- The submit button is now inside a <fieldset class="action"> and the
  "Cancel" link now has the "cancel" class.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>