Log Message:
Update dialog to 1.3.20160209.

2016/02/09
	+ modify editbox widget to add a trailing newline if the text has none
	  to ensure the last line is not ignored (report by Florent Rougon).
	+ change mouse initialization to look for button-presses rather than
	  button-clicks, for better response.
	+ modify dump_curses_key() to show mouse-coding in readable form.
	+ correct mapping of mouse-clicks on the day-grid in calendar widget
	  when "--week-start" is used to set the start of the week (report by
	  Stefan Vogtner).
	> integrated changes from Stefan Vogtner:
	+ use Gregorian algorithm for leap year
	+ use mktime if available; calendar was written just as it became
	  standard.