PhpWiki 1.5.1 released

This is a bug-fix release.

• fix Bug#456 'Optimizing Database' message sometimes printed on page
• remove FrameInclude plugin (frames are not supported in HTML 5)
• sort tables with tablesorter jQuery plugin instead of sortable.js
• fix Bug#636 Recursive include is not trapped
• fix Bug#647 undefined method WikiDB_backend_dba::WikiDB_backend_dbaBase
• correct total number of pages for AllPagesCreatedByMe, AllPagesOwnedByMe, AllPagesLastEditedByMe
• fix Bug#607 BackLinks do not work inside a [[Help:RichTablePlugin|RichTable]]
• fix Bug#646 Wrong number of links in BackLinks
• make <includeonly> work</includeonly>
• remove old WikiUser code (ENABLE_USER_NEW)
• admin always has rights to see and modify pages, regardless of ACLs, to avoid locking himself out
• add missing images in Sidebar theme