comment deletion, post editing.

* tekuti/comment.scm (make-new-comment): Refactor to decouple comment.scm
  from post.scm.

* tekuti/git.scm (run): Generalize so it can run any executable.
  (git-ls-tree, git-ls-subdirs): Check for a #f treeish, return directly
  in that case, avoiding tracebacks in the forked kid.
  (git-mktree): Return #f if the tree is empty.
  (git-rev-list): New command, something like git log.
  (patch-blob): New function; unused, though. Perhaps I should just
  delete it.
  (git-commit-reverse-operations): New function, constructs munge-tree
  operations to revert a commit.
  (git-revert): New operator, reverts a commit. Can't use git's revert
  because it requires a working tree.
  (munge-tree): Rewrite to unify the various commands, and process the
  commands in order. Makes a bit more garbage, but is much more
  understandable.

* tekuti/page-helpers.scm (post-editing-form): Add a preview.
  (admin-post-url): New helper.
  (redirect): New helper.
  (admin-post-redirect): New helper.

* tekuti/page.scm (page-admin): Show recent changes in the sidebar.
  (page-admin-new-post): Redirect to the new post.
  (page-new-comment): Rework for make-new-comment changes, and redirect
  to the post. Would be nice to redirect to the comment though.
  (page-admin-changes): New page, lists recent changes.
  (page-admin-change): New page, shows a change, allowing it to be
  undone.
  (page-admin-revert-change): New page, actually reverts a change. Thus
  we have comment deletion.

* tekuti/post.scm (munge-post): New helper, factored out of
  make-new-post.
  (parse-post-data): Another new helper. Needs to do more validation,
  though.
  (modify-post): Post editing, yay!

* tekuti/request.scm (parse-www-form-urlencoded): Factored out of
  request-form-data.
  (*request-initializers*): Initialize 'query to have the parsed query
  string data.

* tekuti/url.scm (url:path-part, url:query-part): New somewhat hacky
  functions. url.scm needs some love.
  (url:path-split): Split on only the "path part" of the URL.

* tekuti/util.scm (foldn): New export. Probably a bad idea.
  (match-case): New macro, not used though.
  (string-split/trimming): New util.

* tekuti/web.scm (choose-handler): Update the set of pages.

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