VAT-572 Display Invoicing functionality based on admin globle setting under CiviContribute Component settings.
Changed conditions for dispaly Tax Rate, Tax Amount for 0% tax rates and no tax rates and for Changed in line Total.
VAT-572 Added Email Invoice option for Refunded Contribution.
VAT-572 Added CKeditor for notes or standard terms on CiviContribute component setting page.
VAT-572 Changes in Tax Rate and Total Amount based on line total for issue VAT-434.
VAT-572 Removes notices and warnings.
Merge branch 'VAT-572' of github.com:Parag18/civicrm-core into Parag18-VAT-572

Conflicts:
	CRM/Admin/Form/Preferences/Contribute.php
	CRM/Price/BAO/PriceField.php
	templates/CRM/Price/Form/PriceSet.tpl