LCSH browser: Scope notes added

Upon Jim Weinheimer's suggestion, we now also added the scope notes
to the browser's database.
BTW, LC's tool returns zero hits if you enter "humour", and displays
neither suggestions nor a browse list of terms in the alphabetic 
vicinity. There's a link to a long help page, but this doesn't mention
the possibility of variant spellings.

While taking this in good humor and with all due respect, I'm reluctant
to call it state of the art.

B.Eversberg