First cut at increasing font size for catalogue in staff client

First cut at increasing font size for catalogue in staff client

My XUL skills are rusty and thin, so I took a simplistic approach
to increasing font size. I have added two buttons, one that will use the
'font-adjust-size' property to increase the font, using a value of '1'. The other
button resets the font to normal. I thought about using the XUL preferences
as a way to create an increment but the preferences seem to be meant to
be retained across sessions. I also suspect there's a browser directive
that increases the size much more elegantly but I couldn't unearth it. Did
I mention this was a first cut at this?

Signed-off-by: Art Rhyno <art632000@yahoo.ca>