Revision 1864832

Implemented: Homogenize displaying number with multiple format
(OFBIZ-7532)

To display a number we had different possibilities :
 * on ftl use the template <@ofbizAmount and <@ofbizCurrency
 * by java call a function UtilFormatOut.formatAmount, UtilFormatOut.formatPrice, UtilFormatOut.formatQuantity, etc..
 * by form widget, use <display type=accounting-number for accounting but nothing for other

To simplify and homogenize all, I implemented a number type purpose :
   * default: display a number by default, use when no purpose is present
   * quantity: display a number as a quantity
   * amount: display a number as an amount (like price without currency)
   * spelled: litteral displaying for a number (use on <@ofbizAmount ftl only before)
   * percentage: display a number as a percentage
   * accounting: diplay a number for accounting specific

Each purpose can be associate to a number for displaying it :
   * on ftl <@ofbizNumber number=value format=purpose/>
   * on java UtilFormatOut.formatNumber(value, purpose, delegator, locale)
   * on form widget <display type=number format=purpose/>

The format use by a purpose is define on framework/common/config/number.properties with the template
    .displaying.format = ##0.00

With this, you can surchage a configuration, create your own purpose or surchage only one through entity SystemProperty.

Concerning the backware compatibility: 
 * For the ftl the template <@ofbizAmount is now a link to '<@ofbizNumber format=amount'
 * For java all previous function call UtilFormatOut.formatNumber with the matching purpose
 * For form xml accounting-number is managed as an exection

Last point, display a currency is different that a number, so I didn't refactoring some code for this case (only move properties from general to number for centralize de configuration on the same file)

Thanks Charles Steltzlen to start the refactoring