Add year rounding option to preferences

Fixes #12422

gramps/gen/config.py

@@ -331,6 +331,7 @@ def emit(key):
 register("preferences.family-relation-type", 3)  # UNKNOWN
 register("preferences.age-display-precision", 1)
 register("preferences.age-after-death", True)
+register("preferences.age-rounded-year", True)
 register("preferences.cite-plugin", "cite-legacy")
 
 register("colors.scheme", 0)

gramps/gen/lib/date.py

@@ -457,7 +457,9 @@ def _format(self, diff_tuple, dlocale=glocale):
             ).format(number_of=diff_tuple[0])
             detail += 1
         if self.precision == detail:
-            if diff_tuple[1] >= 6:  # round up years
+            if diff_tuple[1] >= 6 and config.get(
+                "preferences.age-rounded-year"
+            ):  # round up years
                 # Translators: leave all/any {...} untranslated
                 retval = ngettext(
                     "{number_of} year", "{number_of} years", diff_tuple[0] + 1

gramps/gui/configure.py

@@ -1564,6 +1564,17 @@ def add_data_panel(self, configdialog):
         grid.attach(lwidget, 1, row, 1, 1)
         grid.attach(obox, 2, row, 2, 1)
 
+        row += 1
+        # Display rounded year
+        self.add_checkbox(
+            grid,
+            _("Round the year"),
+            row,
+            "preferences.age-rounded-year",
+            start=2,
+            stop=3,
+        )
+
         row += 1
         # Display ages for events after death
         self.add_checkbox(