* [CHD-3411] [Import/Worklists/Usability] After importing a file of CSV records into a worklist, the number of imported records is now displayed above the worklist. This provides a visual cue to workers, as many people weren't sure that anything had happened after a file was uploaded.
* [Virtual Attendants/Comments/Attachments] The 'Relay to worker email' Virtual Attendant action on 'New comment on conversation' now includes comment attachments in the outgoing messages.
* [Import/Worklist/Usability] When importing on a worklist, any custom fields that are members of custom fieldsets will now be grouped together.
* [Custom Fieldsets/Import/Virtual Attendants] Fixed an issue on imports and Virtual Attendants where setting individual custom fields from a fieldset didn't link that fieldset to the record.  This led to the values being set, but when viewing the record they weren't displaying.
6.4.3-dev
* [CHD-3430] [Mail Filtering/VA/Simulator] Fixed an issue where Virtual Attendant simulator output didn't display for the 'Set header' action in Mail Filtering behaviors.
* [CHD-3429] [Mail Filtering/Headers] Mail Filtering VA behaviors that use the 'Set header' action can now use placeholders in the 'Header' and 'Value' fields.
* [Mail/Parser/Relay] Fixed an issue with the '#comment' action on relay replies.
* [Calendars] Fixed a notice in calendars when using PHP 5.4+.
* [Virtual Attendants] All Virtual Attendant behaviors can now utilize a new '(Set a custom placeholder)' action to create synthetic placeholders using snippets and scripts.  This is similar to using private behavior variables, but custom placeholders don't need to be formally defined before they are used.
6.4.3-release checkpoint
Merge branch '6.4.3' into stable