Fixed list padding.
Fixed width calculation for numbered items.
Fixed IndentedInLists test.
Fixed calculation of padding.
Fixed Code/ListBreakAfter test to conform to new 2-blank-lines rule.
Fixed Code/IndentedInLists to conform to new tight/loose rule.
Fixed spacing bug with blank lines containing only spaces.
Fixed Code/BlankLines test to conform to new 2-blank-lines rule.