Change bin/UpdateMembershipRecord.php to use FROM email address defined in civicrm.settings.php

Update the code in bin/UpdateMembershipRecord.php to use a FROM email address defined in civicrm.settings.php.

This improvement would reduce the number of steps required during an upgrade, and would help make civicrm more friendly to Drupal multi-site installations (where more than one Drupal install is using the CiviCRM codebase and would need different FROM addresses).

1. Changes required in bin/UpdateMembershipRecord.php:
a. Remove line 218 ($from =...)
b. Change line 219 so $from becomes CIVICRM_FROM_ADDRESS

2. Add the following to civicrm.settings.php:
// set FROM email address for membership reminder emails
define(CIVICRM_FROM_ADDRESS,'EMAIL@FIXME.ORG');

3. Change CiviCRM Upgrade instructions to remove need to update FROM address