Bug 6901: Add classes to XSLT detail view in OPAC

Bug 6901: Add classes to XSLT detail view in OPAC

This patch adds css classes to the fields in XSLT OPAC view so
you can use OpacUserCss system preference for formatting
and hiding fields.

The css classes are named like the labels with additional underscores
where necessary.

Example:
.publisher {
display:none;
}

.other_title {
font-weight: bold;
}

Note: Patch also moves some hard-coded CSS from Utils into the CSS file (only
apples for 880 fields)

Signed-off-by: Liz Rea <lrea@nekls.org>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>