Added new config var: campaign_max_soft_bounces
Added new config var: campaign_max_soft_bounces

New sugar_config['campaign_max_soft_bounces'] - will be used in EmailMan.php to avoid hard-coding the number of times we retry sending an email before identifying this as a hard bounce and failing to retry. See "Bounced Messages, Other" description on this link: https://support.sugarcrm.com/02_Documentation/01_Sugar_Editions/04_Sugar_Professional/Sugar_Professional_6.5/Application_Guide/32_Campaigns/#Campaign_Response_Subpanels
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