Initial selfcheck styling enhancements

* Convert action links to buttons for increased clarity
* Convert dashed fieldsets to gradient backed bubbles for depth
* Color line-item table headers to distinguish from actual line-items
* Color logo background for increased contrast
* Larger input box
* Background on prompts to distinguish from logo background

Signed-off-by: Michael Peters <mrpeters@library.in.gov>
Signed-off-by: Pasi Kallinen <pasi.kallinen@pttk.fi>
Signed-off-by: Ben Shum <bshum@biblio.org>

Conflicts:
	Open-ILS/src/templates/circ/selfcheck/main.tt2
	Open-ILS/src/templates/circ/selfcheck/summary.tt2

Signed-off-by: Ben Shum <bshum@biblio.org>