improve receipt/details reports and implement number formatting

1) eager load reports for receipt/details
2) introduce number_format lookups to replace print_settings for number formatting
3) implement NumberFormattable concern, reference number_format lookups or print_settings if not exist, to get number format settings and number formatting
4) replace rails NumberHelper.number_with_precision with NumberFormattable.number_format hopefully to reduce overhead, formatting numbers for huge lists of data

app/pdf/order_summary_customise_pdf.rb

@@ -1,5 +1,5 @@
 class OrderSummaryCustomisePdf < Prawn::Document
-  include ActionView::Helpers::NumberHelper
+  include NumberFormattable
   attr_accessor :label_width,:price_column_width,:page_width, :page_height, :margin, :price_width, :item_width, :header_font_size, :item_font_size,:order_no_font_size,:item_height,:qty_width,:total_width,:item_description_width
   def initialize(print_settings,order, print_status, order_items = nil,alt_name,before_updated_qty)
     self.page_width = print_settings.page_width
@@ -48,9 +48,9 @@ class OrderSummaryCustomisePdf < Prawn::Document
 
     # order items
     if order_items == nil
-      order_items(order, alt_name, print_settings.precision)
+      order_items(order, alt_name, precision)
     else
-      order_items(order_items, alt_name, print_settings.precision)
+      order_items(order_items, alt_name, precision)
     end
   end
 
@@ -113,7 +113,7 @@ class OrderSummaryCustomisePdf < Prawn::Document
         end
 
         bounding_box([self.item_width - 10,y_position], :width => self.qty_width) do
-          text " [#{number_with_precision(odi.qty, :precision => precision.to_i)}]", :size => self.item_font_size,:align => :left
+          text " [#{number_format(odi.qty, :precision => precision.to_i)}]", :size => self.item_font_size,:align => :left
         end
 
         bounding_box([0,y_position], :width => self.item_width) do