Make parse_date accept several short forms.

Short forms are only accepted in interactive mode (e.g. when using the
"Go to" function, editing a recurrent item's end date, and so on).

Samples: "1/1/30" for "01/01/2030", "26" for the 26th of the currently
selected month/year or "3/1" for Mar 01 (or Jan 03, depending on the
date format) of the currently selected year.

src/calcurse.h

@@ -1,4 +1,4 @@
-/*	$Id: calcurse.h,v 1.5 2010/03/22 08:16:33 culot Exp $	*/
+/*	$Id: calcurse.h,v 1.6 2011/01/11 22:10:48 fleischer Exp $	*/
 
 /*
  * Calcurse - text-based organizer
@@ -873,7 +873,8 @@ long         mystrtol (const char *);
 void         print_bool_option_incolor (WINDOW *, unsigned, int, int);
 char        *new_tempfile (const char *, int);
 void         erase_note (char **, enum eraseflg);
-int          parse_date (char *, enum datefmt, int *, int *, int *);
+int          parse_date (char *, enum datefmt, int *, int *, int *,
+                         struct date *);
 char        *str_toupper (char *);
 void         file_close (FILE *, const char *);
 void         psleep (unsigned);