MediaWiki:Flow-compare-revisions-header-postsummary/qqq

Header for a page showing a "diff" between two revisions of a Flow post summary. Parameters:
 * $1 - the title of the Board on which this post sits. Example: User talk:Andrew
 * $2 - the subject of the Topic in which this post sits
 * $3 - URL to the Board, with the fragment set to the post in question
 * $4 - URL to the Topic, with the fragment set to the post in question
 * $5 - URL to the history page for this post