Update to 2.55. From the changelog:

* remove: New plugin that adds the ability to remove pages via the
    web. (Sponsored by The TOVA Company.)
* rename: New plugin that adds the ability to rename pages via the
    web. (Sponsored by The TOVA Company.) (This one's for you, Kyle.)
* All rcs backends need to implement rcs_remove, rcs_commitstaged,
    and rcs_rename. (Done for svn, git).
* This version adds renamepage hooks, which can be used to modify
    page content, including links, during renames.
* prefix_directives enabled in doc wiki, all preprocessor directives
    converted. (Simon McVittie)
* editpage: Don't show attachments link when attachments are disabled.
* tag: Allow tagbase to be overridden by starting a tag with "./"
    or "/". (Simon McVittie)
* Really fix bug with links to pages with names containing colons.
    Previous fix mised a few cases.
* Avoid troublesome abs_path calls in wrapper setup.
* Add allow_symlinks_before_srcdir config setting that can be used
    to avoid a security check that is a good safe default, but
    problimatic overkill in some situations.
* Don't allow uploading an attachment with the same name as an
    existing page, to avoid confusion.
* Split out error messages from editpage.tmpl into several separate
    templates.
* attachment: Do not escape _ when determining attachment filenames.
* Rebuild pages that change their type. (Gabriel McManus)
* monotone: Add support for rename, delete, and also diff. (William Uther)
* toggle: Fix incompatability between javascript and webkit.
* bzr: Add support for rename and delete. (Jelmer Vernooij)
* attachment: Use relative paths when inserting links.
* toggle: Fix for when html got tidied. Closes: #492529 (Enrico Zini)
* cutpaste: New plugin by Enrico Zini

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