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/controllers/concerns/number_formattable.rb

@@ -0,0 +1,57 @@
+module NumberFormattable
+  extend ActiveSupport::Concern
+
+  def precision
+    @precision ||= Lookup.number_formats.find { |f| f.name.parameterize.underscore == 'precision'}
+    if @precision
+      @precision.value.to_i
+    else
+      @print_settings ||= PrintSetting.get_precision_delimiter
+      if @print_settings
+        @print_settings.precision.to_i
+      end
+    end || 2
+  end
+
+  def delimiter
+    @delimiter ||= Lookup.number_formats.find { |f| f.name.parameterize.underscore == 'delimiter'}
+    if @delimiter
+      @delimiter_value ||= @delimiter.value.to_s.gsub(/\\u(\h{4})/) { |m| [$1].pack("H*").unpack("n*").pack("U*") }
+    else
+      @print_settings ||= PrintSetting.get_precision_delimiter
+      if @print_settings
+        "," if @print_settings.delimiter
+      end
+    end || ""
+  end
+
+  def strip_insignificant_zeros
+    @strip_insignificant_zeros ||= Lookup.number_formats.find { |f| f.name.parameterize.underscore == 'strip_insignificant_zeros'}
+    if @strip_insignificant_zeros
+      ['1', 't', 'true', 'on', 'y', 'yes'].include? @strip_insignificant_zeros.value.to_s
+    end || false
+  end
+
+	def number_format(number, options = {})
+		options[:precision] = options[:precision] || precision
+		# options[:delimiter] = options[:delimiter] || delimiter
+		options[:strip_insignificant_zeros] = options[:strip_insignificant_zeros] || strip_insignificant_zeros
+
+		if options[:precision] > 0
+			if options[:strip_insignificant_zeros]
+				formatted = "%.12g" % number.round(options[:precision])
+			else
+				formatted = "%.#{options[:precision]}f" % number.round(options[:precision])
+			end
+		else
+			formatted = number.to_i.to_s
+		end
+		
+		if options[:delimiter] &&
+			formatted = formatted.gsub(/(\d)(?=\d{3}+(\.\d*)?$)/, "\\1#{options[:delimiter]}")
+		end
+
+		return formatted
+	end
+
+end