* [Placeholders/Usability] When editing a text field that supports placeholder syntax, a help button is now displayed. When clicked, a help popup explains placeholders and scripting along with common examples.  This is implemented when editing snippet records, editing group signatures, editing reply-to signatures, and editing Virtual Attendants outcomes and actions.  Previously, workers had to separately open the documentation to research the available options.
* [Placeholders/Usability] When writing in a text field that supports placeholder syntax, scripting commands ({%...%}) and filters (|) are now suggested and autocompleted.  This is supported when editing group signatures, when editing reply-to signatures, when editing snippets, and when editing Virtual Attendant outcomes and actions.
* [Snippets/Placeholders/Usability] The syntax tester on snippets will no longer complain about temporary variables being unknown placeholders.
[Code Cleanup]
* [Knowledgebase/Usability] Fixed an issue where the knowledgebase profile page could become stuck always displaying a different tab than 'Article', with no way to reset it.
* [Knowledgebase/Profile/Keyboard] The knowledgebase profile page now supports keyboard shortcuts for quickly changing the active tab.
* [Knowledgebase/Usability] When writing knowledgebase articles, inline images may now be added more easily by clicking a new 'upload image' button in the editor toolbar.  This presents a file chooser popup, which automatically links the new attachment to the article and inserts the appropriate markup to display the image (in Markdown or HTML).  In the past, these images weren't easily handled by Cerb and writers usually resorted to storing images on external sites.
* [Knowledgebase] When viewing a knowledgebase article, any attachments displayed as inline images are removed from the list of downloadable files.  These images can still be saved by right-clicking on them.
* [Support Center/Knowledgebase] In the Support Center, when a knowledgebase article contains attachments that are displayed as inline images, the image URLs will be automatically rewritten to use the portal's location.  Normally such attachments would require logging in to Cerb to view.  These images will also not be included in the list of downloadable files.  This simplifies the display of inline images as attachments by making them viewable to both internal workers and external portal visitors without having to host images on a third-party site.
6.8-dev checkpoint