datetime type de champ: changed the years range from [1950;2100] to [to current year - 1;

current year + 50] (or [entered_date; current_year + 50] if old date already entered) because:
The type_de_champ Datetime is used for close future dates and very close past dates (for accident declaration for ex.)
The select currently has a range from 1950 to 2100, so 70+ years not supposed to be used, leading to:
- many bad data entered (0000 or 1950 to not scroll)
- making it difficult for users to give the proper date (current date is lost in the middle of 149 others) so risk to be lazy and select a random one or genuinely make a mistake

app/helpers/champ_helper.rb

@@ -56,4 +56,12 @@ module ChampHelper
       end
     end
   end
+
+  def datetime_start_year(date)
+    if date == nil || date.year == 0 || date.year >= Date.today.year - 1
+      Date.today.year - 1
+    else
+      date.year
+    end
+  end
 end

app/views/shared/dossiers/editable_champs/_datetime.html.haml

@@ -1,4 +1,4 @@
 - parsed_value = champ.value.present? ? Time.zone.parse(champ.value) : nil
 
 .datetime
-  = form.datetime_select(:value, selected: parsed_value, start_year: 1950, end_year: 2100, minute_step: 5, include_blank: true)
+  = form.datetime_select(:value, selected: parsed_value, start_year: datetime_start_year(parsed_value), end_year: Date.today.year + 50, minute_step: 5, include_blank: true)