Bug 2774 - Path to theme is hard-coded in many places

Bug 2774 - Path to theme is hard-coded in many places

This patch corrects more places in Koha where the path to the "prog"
theme is hard-coded in templates, CSS, and scripts.

Staff client home page:

Paths to the Koha logo background image and the module image sprite have
been corrected. Inactive and hover states of the module links
(circulation, patrons, etc) should look correct.

addbiblio.pl:

An <img> tag is replaced with a text link and an
additional CSS class. CSS uses an image-replacement technique to display
the image as before.

To test, open a blank or existing bibliographic record for editing.
Confirm that the "tag editor" icon displays correctly in two cases: 1)
tags linked to plugin editors and 2) tags linked to authorities. Both
should look correct and work correctly.

System preferences:

The system preferences editor appends a "loading" image to system
preference submit buttons when they are clicked. This patch changes
ajax.js to insert a <span> styled with a background-image instead.

To test, open system preferences and modify any preference. Submit the
change and confirm that the "loading" image appears correctly.

Background jobs:

Any place in Koha where a background job is used displays a progress
bar. This patch corrects the path in CSS to the progress bar image. To
test, perform an action which triggers the display of a progress bar.
For instance, batch modification of items. Confirm that the progress bar
image displays correctly.

blue.css:

I don't know if this is still used by anyone, but a couple of image
paths in this CSS file have been corrected.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Passes all tests, QA script and test plan.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>