TPAC: Improve display of holds/copy counts on record details

TPAC: Improve display of holds/copy counts on record details

Based on some suggestions from Thomas Berezansky in LP 906168:

  * Change the "Copies" header to "Available copies"
  * Simplify the copy language to "# copies at <library>" (we still need
    the noun "copies" but "available" has been factored out)
  * Create a "Holds" header and move the holds information under that
  * Put the "Available copies" and "Holds" into inline-block elements
    so that they can take less vertical space on a wide screen but
    will wrap on a narrow screen.
  * Fix the line spacing between LI elements

In addition, break up the lengthy summary TT2 file into a few smaller
parts. In particular, make a copy_counts.tt2 file as sites are very
likely to customize this to, in some cases, not show the consortial
counts, or in other cases to only show the consortial count and current
search library.

Also fix some horrible CSS issues in the header in which the "Place
hold" and "Add to list" buttons were above the title / image, as well as
remove some of the CSS manipulation to plain H2 elements that gave them
no top margin.

Signed-off-by: Dan Scott <dan@coffeecode.net>