grid: The extra "+1" caused unnecessary scrolling

This was evident in the Calendar Combobox with the focus date of
30 Nov 2013. The Sunday column was scrolled off the screen, even though
there was space for it.
calendar: increased the dropdown window slightly of Calendar Combobox

just to make double sure no accidental scrolling occurs in calendar grid.
hyperlink: default URL is now fpGUI website constant value.