Include PM changes in changes-mail and changes.xliff (xliff 2.1)

A Zf_configuration value should in the future decide, if changes made by PMs are included in the changes, that are listed at a workflow step change:

• in mails
• in changes.xliff
• in xliff 2.1 downloads

Only the changes should be included, that are done in the same workflow step. Since the step is currently not tracked for PM changes, there should be a third config value:

• Do not include PM Changes
• Include all PM Changes
• Include only PM Changes of same step

The default setting should be: Include the changes. Attention: Existing customers must be advised to set the setting to "off" after updating translate5.