[ready-for-core-team-review]CRM-16189, added code to add settings for accrual (#8573)

[ready-for-core-team-review]CRM-16189, added code to add settings for accrual (#8573)

* CRM-16189, added code to add settings for accrual

----------------------------------------
* CRM-16189: Improve support for Accrual Method bookkeeping
  https://issues.civicrm.org/jira/browse/CRM-16189

* --CRM-16189, added webtest

* --CRM-16189, changd code to show message on pop up and to highlight error field

* CRM-16189, fixed indentation

----------------------------------------
* CRM-16189: Improve support for Accrual Method bookkeeping
  https://issues.civicrm.org/jira/browse/CRM-16189

* CRM-16189, changed class name

----------------------------------------
* CRM-16189: Improve support for Accrual Method bookkeeping
  https://issues.civicrm.org/jira/browse/CRM-16189

* CRM-16189, changed to JS function as per doc in https://wiki.civicrm.org/confluence/display/CRMDOC/Javascript+Reference

----------------------------------------
* CRM-16189: Improve support for Accrual Method bookkeeping
  https://issues.civicrm.org/jira/browse/CRM-16189

* --CRM-16189, removed cuft code, used on jq function to trigger click function

* CRM-16189, updated code as per standards

----------------------------------------
* CRM-16189: Improve support for Accrual Method bookkeeping
  https://issues.civicrm.org/jira/browse/CRM-16189